25731 has 8 divisors (see below), whose sum is σ = 38160. Its totient is φ = 17136.

The previous prime is 25717. The next prime is 25733. The reversal of 25731 is 13752.

It is not a de Polignac number, because 25731 - 2⁶ = 25667 is a prime.

It is a super-2 number, since 2×25731² = 1324168722, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25731.

It is not an unprimeable number, because it can be changed into a prime (25733) 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, 450 + ... + 503.

It is an arithmetic number, because the mean of its divisors is an integer number (4770).

2²⁵⁷³¹ is an apocalyptic number.

25731 is a deficient number, since it is larger than the sum of its proper divisors (12429).

25731 is an equidigital number, since it uses as much as digits as its factorization.

25731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962 (or 956 counting only the distinct ones).

The product of its digits is 210, while the sum is 18.

The square root of 25731 is about 160.4088526235. The cubic root of 25731 is about 29.5224381620.

The spelling of 25731 in words is "twenty-five thousand, seven hundred thirty-one".