129836257 has 2 divisors, whose sum is σ = 129836258. Its totient is φ = 129836256.

The previous prime is 129836249. The next prime is 129836269. The reversal of 129836257 is 752638921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92332881 + 37503376 = 9609^2 + 6124^2 .

It is a cyclic number.

It is not a de Polignac number, because 129836257 - 2³ = 129836249 is a prime.

It is not a weakly prime, because it can be changed into another prime (129830257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64918128 + 64918129.

It is an arithmetic number, because the mean of its divisors is an integer number (64918129).

Almost surely, 2^129836257 is an apocalyptic number.

It is an amenable number.

129836257 is a deficient number, since it is larger than the sum of its proper divisors (1).

129836257 is an equidigital number, since it uses as much as digits as its factorization.

129836257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 43.

The square root of 129836257 is about 11394.5713828998. The cubic root of 129836257 is about 506.3669231128.

The spelling of 129836257 in words is "one hundred twenty-nine million, eight hundred thirty-six thousand, two hundred fifty-seven".