25539231 has 4 divisors (see below), whose sum is σ = 34052312. Its totient is φ = 17026152.

The previous prime is 25539209. The next prime is 25539233. The reversal of 25539231 is 13293552.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 25539231 - 2⁶ = 25539167 is a prime.

It is a super-2 number, since 2×25539231² = 1304504640142722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25539233) 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, 4256536 + ... + 4256541.

It is an arithmetic number, because the mean of its divisors is an integer number (8513078).

Almost surely, 2^25539231 is an apocalyptic number.

25539231 is a deficient number, since it is larger than the sum of its proper divisors (8513081).

25539231 is an equidigital number, since it uses as much as digits as its factorization.

25539231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8513080.

The product of its digits is 8100, while the sum is 30.

The square root of 25539231 is about 5053.6354241279. The cubic root of 25539231 is about 294.4891320912.

The spelling of 25539231 in words is "twenty-five million, five hundred thirty-nine thousand, two hundred thirty-one".