129591257 has 2 divisors, whose sum is σ = 129591258. Its totient is φ = 129591256.

The previous prime is 129591251. The next prime is 129591281. The reversal of 129591257 is 752195921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96746896 + 32844361 = 9836^2 + 5731^2 .

It is a cyclic number.

It is not a de Polignac number, because 129591257 - 2¹⁴ = 129574873 is a prime.

It is equal to p_7356398 and since 129591257 and 7356398 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (129591251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64795628 + 64795629.

It is an arithmetic number, because the mean of its divisors is an integer number (64795629).

Almost surely, 2^129591257 is an apocalyptic number.

It is an amenable number.

129591257 is a deficient number, since it is larger than the sum of its proper divisors (1).

129591257 is an equidigital number, since it uses as much as digits as its factorization.

129591257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 41.

The square root of 129591257 is about 11383.8155729966. The cubic root of 129591257 is about 506.0482190921.

The spelling of 129591257 in words is "one hundred twenty-nine million, five hundred ninety-one thousand, two hundred fifty-seven".