25316257 has 4 divisors (see below), whose sum is σ = 25672896. Its totient is φ = 24959620.

The previous prime is 25316237. The next prime is 25316279. The reversal of 25316257 is 75261352.

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 a de Polignac number, because none of the positive numbers 2^k-25316257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25316237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178213 + ... + 178354.

It is an arithmetic number, because the mean of its divisors is an integer number (6418224).

Almost surely, 2^25316257 is an apocalyptic number.

It is an amenable number.

25316257 is a deficient number, since it is larger than the sum of its proper divisors (356639).

25316257 is an equidigital number, since it uses as much as digits as its factorization.

25316257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356638.

The product of its digits is 12600, while the sum is 31.

The square root of 25316257 is about 5031.5263091829. The cubic root of 25316257 is about 293.6295989446.

The spelling of 25316257 in words is "twenty-five million, three hundred sixteen thousand, two hundred fifty-seven".