25497513 has 18 divisors (see below), whose sum is σ = 37524734. Its totient is φ = 16680384.

The previous prime is 25497509. The next prime is 25497523. The reversal of 25497513 is 31579452.

25497513 is a `hidden beast` number, since 2 + 54 + 97 + 513 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 19607184 + 5890329 = 4428^2 + 2427^2 .

It is not a de Polignac number, because 25497513 - 2² = 25497509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25497523) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 129331 + ... + 129527.

Almost surely, 2^25497513 is an apocalyptic number.

It is an amenable number.

25497513 is a deficient number, since it is larger than the sum of its proper divisors (12027221).

25497513 is an equidigital number, since it uses as much as digits as its factorization.

25497513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473 (or 273 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 25497513 is about 5049.5062134827. The cubic root of 25497513 is about 294.3286966538.

The spelling of 25497513 in words is "twenty-five million, four hundred ninety-seven thousand, five hundred thirteen".