25131131 has 2 divisors, whose sum is σ = 25131132. Its totient is φ = 25131130.

The previous prime is 25131107. The next prime is 25131133. The reversal of 25131131 is 13113152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25131131 - 2¹⁰ = 25130107 is a prime.

It is a super-2 number, since 2×25131131² = 1263147490678322, which contains 22 as substring.

Together with 25131133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25131133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12565565 + 12565566.

It is an arithmetic number, because the mean of its divisors is an integer number (12565566).

Almost surely, 2^25131131 is an apocalyptic number.

25131131 is a deficient number, since it is larger than the sum of its proper divisors (1).

25131131 is an equidigital number, since it uses as much as digits as its factorization.

25131131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90, while the sum is 17.

The square root of 25131131 is about 5013.0959496104. The cubic root of 25131131 is about 292.9121217196.

Adding to 25131131 its reverse (13113152), we get a palindrome (38244283).

The spelling of 25131131 in words is "twenty-five million, one hundred thirty-one thousand, one hundred thirty-one".