25931131 has 4 divisors (see below), whose sum is σ = 25970112. Its totient is φ = 25892152.

The previous prime is 25931099. The next prime is 25931141. The reversal of 25931131 is 13113952.

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

It is a cyclic number.

It is not a de Polignac number, because 25931131 - 2⁵ = 25931099 is a prime.

It is a super-2 number, since 2×25931131² = 1344847109878322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25931096 and 25931105.

It is not an unprimeable number, because it can be changed into a prime (25931141) 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, 18475 + ... + 19828.

It is an arithmetic number, because the mean of its divisors is an integer number (6492528).

Almost surely, 2^25931131 is an apocalyptic number.

25931131 is a deficient number, since it is larger than the sum of its proper divisors (38981).

25931131 is an equidigital number, since it uses as much as digits as its factorization.

25931131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38980.

The product of its digits is 810, while the sum is 25.

The square root of 25931131 is about 5092.2618746486. The cubic root of 25931131 is about 295.9878061388.

It can be divided in two parts, 25931 and 131, that added together give a palindrome (26062).

The spelling of 25931131 in words is "twenty-five million, nine hundred thirty-one thousand, one hundred thirty-one".