25216131 has 4 divisors (see below), whose sum is σ = 33621512. Its totient is φ = 16810752.

The previous prime is 25216127. The next prime is 25216159. The reversal of 25216131 is 13161252.

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

It is not a de Polignac number, because 25216131 - 2² = 25216127 is a prime.

It is a super-2 number, since 2×25216131² = 1271706525218322, 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 = 25216098 and 25216107.

It is not an unprimeable number, because it can be changed into a prime (25216031) 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, 4202686 + ... + 4202691.

It is an arithmetic number, because the mean of its divisors is an integer number (8405378).

Almost surely, 2^25216131 is an apocalyptic number.

25216131 is a deficient number, since it is larger than the sum of its proper divisors (8405381).

25216131 is an equidigital number, since it uses as much as digits as its factorization.

25216131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8405380.

The product of its digits is 360, while the sum is 21.

The square root of 25216131 is about 5021.5665882272. The cubic root of 25216131 is about 293.2419850142.

Adding to 25216131 its reverse (13161252), we get a palindrome (38377383).

The spelling of 25216131 in words is "twenty-five million, two hundred sixteen thousand, one hundred thirty-one".