25992561 has 16 divisors (see below), whose sum is σ = 39682944. Its totient is φ = 14824704.

The previous prime is 25992523. The next prime is 25992581. The reversal of 25992561 is 16529952.

It is not a de Polignac number, because 25992561 - 2⁷ = 25992433 is a prime.

It is a super-2 number, since 2×25992561² = 1351226454677442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25992581) 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 in 15 ways as a sum of consecutive naturals, for example, 15961 + ... + 17513.

It is an arithmetic number, because the mean of its divisors is an integer number (2480184).

Almost surely, 2^25992561 is an apocalyptic number.

25992561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25992561 is a deficient number, since it is larger than the sum of its proper divisors (13690383).

25992561 is a wasteful number, since it uses less digits than its factorization.

25992561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360.

The product of its digits is 48600, while the sum is 39.

The square root of 25992561 is about 5098.2900074437. The cubic root of 25992561 is about 296.2213502890.

The spelling of 25992561 in words is "twenty-five million, nine hundred ninety-two thousand, five hundred sixty-one".