25681231 has 2 divisors, whose sum is σ = 25681232. Its totient is φ = 25681230.

The previous prime is 25681199. The next prime is 25681247. The reversal of 25681231 is 13218652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25681231 - 2⁵ = 25681199 is a prime.

It is a super-2 number, since 2×25681231² = 1319051251350722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25681231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25681261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12840615 + 12840616.

It is an arithmetic number, because the mean of its divisors is an integer number (12840616).

Almost surely, 2^25681231 is an apocalyptic number.

25681231 is a deficient number, since it is larger than the sum of its proper divisors (1).

25681231 is an equidigital number, since it uses as much as digits as its factorization.

25681231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 25681231 is about 5067.6652415092. The cubic root of 25681231 is about 295.0339173872.

Adding to 25681231 its reverse (13218652), we get a palindrome (38899883).

The spelling of 25681231 in words is "twenty-five million, six hundred eighty-one thousand, two hundred thirty-one".