25557291 has 6 divisors (see below), whose sum is σ = 36916100. Its totient is φ = 17038188.

The previous prime is 25557251. The next prime is 25557293. The reversal of 25557291 is 19275552.

It is a de Polignac number, because none of the positive numbers 2^k-25557291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25557293) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1419841 + ... + 1419858.

Almost surely, 2^25557291 is an apocalyptic number.

25557291 is a deficient number, since it is larger than the sum of its proper divisors (11358809).

25557291 is a wasteful number, since it uses less digits than its factorization.

25557291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839705 (or 2839702 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 25557291 is about 5055.4219408473. The cubic root of 25557291 is about 294.5585314735.

The spelling of 25557291 in words is "twenty-five million, five hundred fifty-seven thousand, two hundred ninety-one".