25613591 has 2 divisors, whose sum is σ = 25613592. Its totient is φ = 25613590.

The previous prime is 25613587. The next prime is 25613603. The reversal of 25613591 is 19531652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25613591 - 2² = 25613587 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25613531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12806795 + 12806796.

It is an arithmetic number, because the mean of its divisors is an integer number (12806796).

Almost surely, 2^25613591 is an apocalyptic number.

25613591 is a deficient number, since it is larger than the sum of its proper divisors (1).

25613591 is an equidigital number, since it uses as much as digits as its factorization.

25613591 is an odious number, because the sum of its binary digits is odd.

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

The square root of 25613591 is about 5060.9871566721. The cubic root of 25613591 is about 294.7746665726.

The spelling of 25613591 in words is "twenty-five million, six hundred thirteen thousand, five hundred ninety-one".