15561025 has 12 divisors (see below), whose sum is σ = 19542400. Its totient is φ = 12289680.

The previous prime is 15560989. The next prime is 15561037. The reversal of 15561025 is 52016551.

15561025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15561025 - 2¹³ = 15552833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1965 + ... + 5914.

Almost surely, 2^15561025 is an apocalyptic number.

It is an amenable number.

15561025 is a deficient number, since it is larger than the sum of its proper divisors (3981375).

15561025 is an equidigital number, since it uses as much as digits as its factorization.

15561025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7968 (or 7963 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 15561025 is about 3944.7465064311. The cubic root of 15561025 is about 249.6583332681.

Adding to 15561025 its reverse (52016551), we get a palindrome (67577576).

The spelling of 15561025 in words is "fifteen million, five hundred sixty-one thousand, twenty-five".