25961569 has 4 divisors (see below), whose sum is σ = 26594820. Its totient is φ = 25328320.

The previous prime is 25961563. The next prime is 25961597. The reversal of 25961569 is 96516952.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5349969 + 20611600 = 2313^2 + 4540^2 .

It is a cyclic number.

It is not a de Polignac number, because 25961569 - 2¹³ = 25953377 is a prime.

It is a super-2 number, since 2×25961569² = 1348006129883522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25961563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316564 + ... + 316645.

It is an arithmetic number, because the mean of its divisors is an integer number (6648705).

Almost surely, 2^25961569 is an apocalyptic number.

It is an amenable number.

25961569 is a deficient number, since it is larger than the sum of its proper divisors (633251).

25961569 is an equidigital number, since it uses as much as digits as its factorization.

25961569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633250.

The product of its digits is 145800, while the sum is 43.

The square root of 25961569 is about 5095.2496504097. The cubic root of 25961569 is about 296.1035711640.

The spelling of 25961569 in words is "twenty-five million, nine hundred sixty-one thousand, five hundred sixty-nine".