25565513 has 2 divisors, whose sum is σ = 25565514. Its totient is φ = 25565512.

The previous prime is 25565503. The next prime is 25565537. The reversal of 25565513 is 31556552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17875984 + 7689529 = 4228^2 + 2773^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25565513 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25565513.

It is not a weakly prime, because it can be changed into another prime (25565503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12782756 + 12782757.

It is an arithmetic number, because the mean of its divisors is an integer number (12782757).

Almost surely, 2^25565513 is an apocalyptic number.

It is an amenable number.

25565513 is a deficient number, since it is larger than the sum of its proper divisors (1).

25565513 is an equidigital number, since it uses as much as digits as its factorization.

25565513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22500, while the sum is 32.

The square root of 25565513 is about 5056.2350617826. The cubic root of 25565513 is about 294.5901154232.

The spelling of 25565513 in words is "twenty-five million, five hundred sixty-five thousand, five hundred thirteen".