25691513 has 2 divisors, whose sum is σ = 25691514. Its totient is φ = 25691512.

The previous prime is 25691459. The next prime is 25691527. The reversal of 25691513 is 31519652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25684624 + 6889 = 5068^2 + 83^2 .

It is a cyclic number.

It is not a de Polignac number, because 25691513 - 2¹⁴ = 25675129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25691513.

It is not a weakly prime, because it can be changed into another prime (25690513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12845756 + 12845757.

It is an arithmetic number, because the mean of its divisors is an integer number (12845757).

Almost surely, 2^25691513 is an apocalyptic number.

It is an amenable number.

25691513 is a deficient number, since it is larger than the sum of its proper divisors (1).

25691513 is an equidigital number, since it uses as much as digits as its factorization.

25691513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 32.

The square root of 25691513 is about 5068.6796111019. The cubic root of 25691513 is about 295.0732863980.

The spelling of 25691513 in words is "twenty-five million, six hundred ninety-one thousand, five hundred thirteen".