25625581 has 2 divisors, whose sum is σ = 25625582. Its totient is φ = 25625580.

The previous prime is 25625527. The next prime is 25625617. The reversal of 25625581 is 18552652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23912100 + 1713481 = 4890^2 + 1309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25625581 is a prime.

It is a super-2 number, since 2×25625581² = 1313340803175122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25625521) 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, 12812790 + 12812791.

It is an arithmetic number, because the mean of its divisors is an integer number (12812791).

Almost surely, 2^25625581 is an apocalyptic number.

It is an amenable number.

25625581 is a deficient number, since it is larger than the sum of its proper divisors (1).

25625581 is an equidigital number, since it uses as much as digits as its factorization.

25625581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24000, while the sum is 34.

The square root of 25625581 is about 5062.1715695934. The cubic root of 25625581 is about 294.8206551379.

The spelling of 25625581 in words is "twenty-five million, six hundred twenty-five thousand, five hundred eighty-one".