25072561 has 4 divisors (see below), whose sum is σ = 25306992. Its totient is φ = 24838132.

The previous prime is 25072549. The next prime is 25072577. The reversal of 25072561 is 16527052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25072561 - 2⁵ = 25072529 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25072591) 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, 117055 + ... + 117268.

It is an arithmetic number, because the mean of its divisors is an integer number (6326748).

Almost surely, 2^25072561 is an apocalyptic number.

It is an amenable number.

25072561 is a deficient number, since it is larger than the sum of its proper divisors (234431).

25072561 is a wasteful number, since it uses less digits than its factorization.

25072561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234430.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 25072561 is about 5007.2508425283. The cubic root of 25072561 is about 292.6843934367.

The spelling of 25072561 in words is "twenty-five million, seventy-two thousand, five hundred sixty-one".