129290257 has 2 divisors, whose sum is σ = 129290258. Its totient is φ = 129290256.

The previous prime is 129290237. The next prime is 129290263. The reversal of 129290257 is 752092921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73205136 + 56085121 = 8556^2 + 7489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129290257 is a prime.

It is not a weakly prime, because it can be changed into another prime (129290237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64645128 + 64645129.

It is an arithmetic number, because the mean of its divisors is an integer number (64645129).

Almost surely, 2^129290257 is an apocalyptic number.

It is an amenable number.

129290257 is a deficient number, since it is larger than the sum of its proper divisors (1).

129290257 is an equidigital number, since it uses as much as digits as its factorization.

129290257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 129290257 is about 11370.5873638964. The cubic root of 129290257 is about 505.6561180588.

The spelling of 129290257 in words is "one hundred twenty-nine million, two hundred ninety thousand, two hundred fifty-seven".