25992581 has 2 divisors, whose sum is σ = 25992582. Its totient is φ = 25992580.

The previous prime is 25992523. The next prime is 25992607. The reversal of 25992581 is 18529952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25090081 + 902500 = 5009^2 + 950^2 .

It is a cyclic number.

It is not a de Polignac number, because 25992581 - 2⁶ = 25992517 is a prime.

It is a super-2 number, since 2×25992581² = 1351228534083122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25997581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12996290 + 12996291.

It is an arithmetic number, because the mean of its divisors is an integer number (12996291).

Almost surely, 2^25992581 is an apocalyptic number.

It is an amenable number.

25992581 is a deficient number, since it is larger than the sum of its proper divisors (1).

25992581 is an equidigital number, since it uses as much as digits as its factorization.

25992581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 41.

The square root of 25992581 is about 5098.2919688853. The cubic root of 25992581 is about 296.2214262649.

The spelling of 25992581 in words is "twenty-five million, nine hundred ninety-two thousand, five hundred eighty-one".