25331231 has 2 divisors, whose sum is σ = 25331232. Its totient is φ = 25331230.

The previous prime is 25331227. The next prime is 25331249. The reversal of 25331231 is 13213352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25331231 - 2² = 25331227 is a prime.

It is a super-2 number, since 2×25331231² = 1283342527950722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25330231) 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 as a sum of consecutive naturals, namely, 12665615 + 12665616.

It is an arithmetic number, because the mean of its divisors is an integer number (12665616).

Almost surely, 2^25331231 is an apocalyptic number.

25331231 is a deficient number, since it is larger than the sum of its proper divisors (1).

25331231 is an equidigital number, since it uses as much as digits as its factorization.

25331231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 20.

The square root of 25331231 is about 5033.0141068747. The cubic root of 25331231 is about 293.6874793154.

Adding to 25331231 its reverse (13213352), we get a palindrome (38544583).

The spelling of 25331231 in words is "twenty-five million, three hundred thirty-one thousand, two hundred thirty-one".