130 is the natural number following 129 and preceding 131.

One hundred thirty is a sphenic number. It is a noncototient since there is no answer to the equation x - φ(x) = 130.

130 is the only integer that is the sum of the squares of its first four divisors, including 1: 1² + 2² + 5² + 10² = 130.

One hundred thirty is also:

• The designation of a spur route of Interstate 30 to be built in Texarkana, Texas.
• The model number of the C-130 aircraft, capable of in-the-air refueling.
• United States Citizenship and Immigration Services Form Petition for an Alien Relative.
• The year AD 130 or 130 BC.

Other numbers in the 130s

One hundred thirty-one (131, CXXXI) is the natural number following one hundred thirty and preceding one hundred thirty-two. It is the 32nd prime number, and it is a palindromic prime as well as a permutable prime, since it permutes with one hundred thirteen and three hundred eleven.

This number is the sum of three consecutive primes (41 + 43 + 47).

One hundred thirty-one is also:

• The year AD 131 or 131 BC.

One hundred thirty-two (132, CXXXII) is the natural number following one hundred thirty-one and preceding one hundred thirty-three. It is a Catalan number, a Harshad number, a pronic number and a composite number, and its factorization is

One hundred thirty-two is also:

• The year AD 132 or 132 BC.

One hundred thirty-three (133, CXXXIII) is the natural number following one hundred thirty-two and preceding one hundred thirty-four. It is a composite number, and its factorization is

It is the smallest n whose divisors (excluding n itself) added up divide φ(n). It is an octagonal number and a Harshad number.

One hundred thirty-three is also:

• The year AD 133 or 133 BC.

One hundred thirty-four (134, CXXXIV) is the natural number following one hundred thirty-three and preceding one hundred thirty-five. It is a composite number, and its factorization is

It is a nontotient since there is no integer with 134 coprimes below it. And it is a noncototient since there is no integer with 134 integers with common factors below it.

One hundred thirty-four is also:

• The year AD 134 or 134 BC.

One hundred thirty-five (135, CXXXV) is the natural number following one hundred thirty-four and preceding one hundred thirty-six. It is a composite number, and its factorization is

It is a Harshad number.

One hundred thirty-five is also:

• The designation of a spur route of Interstate 35, that goes to Topeka, Kansas.
• The year AD 135 or 135 BC.

One hundred thirty-six (136, CXXXVI) is the natural number following one hundred thirty-five and preceding one hundred thirty-six. It is a composite number, and its factorization is

136 is itself a factor of the Eddington number. 136 is a triangular number, a centered triangular number and a centered nonagonal number.

One hundred thirty-six is also:

• The year AD 136 or 136 BC.

One hundred thirty-seven now has its own article.

One hundred thirty-eight (138, CXXXVIII) is the natural number following one hundred thirty-seven and preceding one hundred thirty-eight. It is a composite number, and its factorization

makes it a sphenic number. This number is the sum of four consecutive primes (29 + 31 + 37 + 41).

One hundred thirty-eight is also:

• The episode number of The Simpsons "138th Episode Spectacular". Most other shows would have used a round number.
• The year AD 138 or 138 BC.

One hundred thirty-nine (139, CXXXIX) is the natural number following one hundred thirty-eight and preceding one hundred forty. It is the 34th prime number, the previous is one hundred thirty-seven, with which it comprises a twin prime.

This number is the sum of five consecutive prime numbers (19 + 23 + 29 + 31 + 37).

One hundred thirty-nine is also:

• The year AD 139 or 139 BC.