25297531 has 8 divisors (see below), whose sum is σ = 30433280. Its totient is φ = 20542248.

The previous prime is 25297507. The next prime is 25297619. The reversal of 25297531 is 13579252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25297531 - 2⁵ = 25297499 is a prime.

It is a super-2 number, since 2×25297531² = 1279930149391922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25297501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94971 + ... + 95236.

It is an arithmetic number, because the mean of its divisors is an integer number (3804160).

Almost surely, 2^25297531 is an apocalyptic number.

25297531 is a deficient number, since it is larger than the sum of its proper divisors (5135749).

25297531 is a wasteful number, since it uses less digits than its factorization.

25297531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190233.

The product of its digits is 18900, while the sum is 34.

The square root of 25297531 is about 5029.6650981949. The cubic root of 25297531 is about 293.5571834983.

The spelling of 25297531 in words is "twenty-five million, two hundred ninety-seven thousand, five hundred thirty-one".