129065257 has 4 divisors (see below), whose sum is σ = 129342096. Its totient is φ = 128788420.

The previous prime is 129065239. The next prime is 129065297. The reversal of 129065257 is 752560921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129065257 - 2⁷ = 129065129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129065297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137719 + ... + 138652.

It is an arithmetic number, because the mean of its divisors is an integer number (32335524).

Almost surely, 2^129065257 is an apocalyptic number.

It is an amenable number.

129065257 is a deficient number, since it is larger than the sum of its proper divisors (276839).

129065257 is an equidigital number, since it uses as much as digits as its factorization.

129065257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276838.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 129065257 is about 11360.6891076202. The cubic root of 129065257 is about 505.3626216230.

The spelling of 129065257 in words is "one hundred twenty-nine million, sixty-five thousand, two hundred fifty-seven".