25231279 has 2 divisors, whose sum is σ = 25231280. Its totient is φ = 25231278.

The previous prime is 25231249. The next prime is 25231301. The reversal of 25231279 is 97213252.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25231279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25231279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25231249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12615639 + 12615640.

It is an arithmetic number, because the mean of its divisors is an integer number (12615640).

Almost surely, 2^25231279 is an apocalyptic number.

25231279 is a deficient number, since it is larger than the sum of its proper divisors (1).

25231279 is an equidigital number, since it uses as much as digits as its factorization.

25231279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 25231279 is about 5023.0746560249. The cubic root of 25231279 is about 293.3006926777.

The spelling of 25231279 in words is "twenty-five million, two hundred thirty-one thousand, two hundred seventy-nine".