25413561 has 16 divisors (see below), whose sum is σ = 38668800. Its totient is φ = 16483824.

The previous prime is 25413539. The next prime is 25413593. The reversal of 25413561 is 16531452.

It is not a de Polignac number, because 25413561 - 2⁹ = 25413049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25413461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11721 + ... + 13718.

It is an arithmetic number, because the mean of its divisors is an integer number (2416800).

Almost surely, 2^25413561 is an apocalyptic number.

It is an amenable number.

25413561 is a deficient number, since it is larger than the sum of its proper divisors (13255239).

25413561 is a wasteful number, since it uses less digits than its factorization.

25413561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25485 (or 25479 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 25413561 is about 5041.1864674896. The cubic root of 25413561 is about 294.0053101915.

The spelling of 25413561 in words is "twenty-five million, four hundred thirteen thousand, five hundred sixty-one".