25318257 has 16 divisors (see below), whose sum is σ = 34514880. Its totient is φ = 16503552.

The previous prime is 25318231. The next prime is 25318273. The reversal of 25318257 is 75281352.

It is not a de Polignac number, because 25318257 - 2⁷ = 25318129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25318217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55173 + ... + 55629.

It is an arithmetic number, because the mean of its divisors is an integer number (2157180).

Almost surely, 2^25318257 is an apocalyptic number.

It is an amenable number.

25318257 is a deficient number, since it is larger than the sum of its proper divisors (9196623).

25318257 is a wasteful number, since it uses less digits than its factorization.

25318257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832.

The product of its digits is 16800, while the sum is 33.

The square root of 25318257 is about 5031.7250521069. The cubic root of 25318257 is about 293.6373310477.

The spelling of 25318257 in words is "twenty-five million, three hundred eighteen thousand, two hundred fifty-seven".