25641513 has 6 divisors (see below), whose sum is σ = 37037754. Its totient is φ = 17094336.

The previous prime is 25641509. The next prime is 25641521. The reversal of 25641513 is 31514652.

25641513 is a `hidden beast` number, since 2 + 5 + 641 + 5 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20766249 + 4875264 = 4557^2 + 2208^2 .

It is not a de Polignac number, because 25641513 - 2² = 25641509 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25641563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1424520 + ... + 1424537.

It is an arithmetic number, because the mean of its divisors is an integer number (6172959).

Almost surely, 2^25641513 is an apocalyptic number.

It is an amenable number.

25641513 is a deficient number, since it is larger than the sum of its proper divisors (11396241).

25641513 is a wasteful number, since it uses less digits than its factorization.

25641513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2849063 (or 2849060 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 25641513 is about 5063.7449580325. The cubic root of 25641513 is about 294.8817413572.

The spelling of 25641513 in words is "twenty-five million, six hundred forty-one thousand, five hundred thirteen".