25031231 has 2 divisors, whose sum is σ = 25031232. Its totient is φ = 25031230.

The previous prime is 25031221. The next prime is 25031233. The reversal of 25031231 is 13213052.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25031231 - 2¹⁰ = 25030207 is a prime.

It is a super-2 number, since 2×25031231² = 1253125050750722, which contains 22 as substring.

Together with 25031233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25031233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12515615 + 12515616.

It is an arithmetic number, because the mean of its divisors is an integer number (12515616).

Almost surely, 2^25031231 is an apocalyptic number.

25031231 is a deficient number, since it is larger than the sum of its proper divisors (1).

25031231 is an equidigital number, since it uses as much as digits as its factorization.

25031231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 25031231 is about 5003.1221252334. The cubic root of 25031231 is about 292.5234831513.

Adding to 25031231 its reverse (13213052), we get a palindrome (38244283).

The spelling of 25031231 in words is "twenty-five million, thirty-one thousand, two hundred thirty-one".