25004561 has 4 divisors (see below), whose sum is σ = 25028532. Its totient is φ = 24980592.

The previous prime is 25004557. The next prime is 25004579. The reversal of 25004561 is 16540052.

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 23668225 + 1336336 = 4865^2 + 1156^2 .

It is a cyclic number.

It is not a de Polignac number, because 25004561 - 2² = 25004557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25004521) 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, 10346 + ... + 12531.

It is an arithmetic number, because the mean of its divisors is an integer number (6257133).

Almost surely, 2^25004561 is an apocalyptic number.

It is an amenable number.

25004561 is a deficient number, since it is larger than the sum of its proper divisors (23971).

25004561 is a wasteful number, since it uses less digits than its factorization.

25004561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23970.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 25004561 is about 5000.4560791992. The cubic root of 25004561 is about 292.4195546666.

The spelling of 25004561 in words is "twenty-five million, four thousand, five hundred sixty-one".