25516131 has 32 divisors (see below), whose sum is σ = 37355520. Its totient is φ = 15444000.

The previous prime is 25516123. The next prime is 25516147. The reversal of 25516131 is 13161552.

It is not a de Polignac number, because 25516131 - 2³ = 25516123 is a prime.

It is a super-2 number, since 2×25516131² = 1302145882418322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25518131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168906 + ... + 169056.

It is an arithmetic number, because the mean of its divisors is an integer number (1167360).

Almost surely, 2^25516131 is an apocalyptic number.

25516131 is a deficient number, since it is larger than the sum of its proper divisors (11839389).

25516131 is a wasteful number, since it uses less digits than its factorization.

25516131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287.

The product of its digits is 900, while the sum is 24.

The square root of 25516131 is about 5051.3494236689. The cubic root of 25516131 is about 294.4003177363.

Adding to 25516131 its reverse (13161552), we get a palindrome (38677683).

The spelling of 25516131 in words is "twenty-five million, five hundred sixteen thousand, one hundred thirty-one".