129972637 has 2 divisors, whose sum is σ = 129972638. Its totient is φ = 129972636.

The previous prime is 129972629. The next prime is 129972643. The reversal of 129972637 is 736279921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91891396 + 38081241 = 9586^2 + 6171^2 .

It is a cyclic number.

It is not a de Polignac number, because 129972637 - 2³ = 129972629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129972737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64986318 + 64986319.

It is an arithmetic number, because the mean of its divisors is an integer number (64986319).

Almost surely, 2^129972637 is an apocalyptic number.

It is an amenable number.

129972637 is a deficient number, since it is larger than the sum of its proper divisors (1).

129972637 is an equidigital number, since it uses as much as digits as its factorization.

129972637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 46.

The square root of 129972637 is about 11400.5542409130. The cubic root of 129972637 is about 506.5441570048.

The spelling of 129972637 in words is "one hundred twenty-nine million, nine hundred seventy-two thousand, six hundred thirty-seven".