15565225 has 24 divisors (see below), whose sum is σ = 21248640. Its totient is φ = 11238720.

The previous prime is 15565219. The next prime is 15565229. The reversal of 15565225 is 52256551.

15565225 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 15565225 - 2⁹ = 15564713 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (15565229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14766 + ... + 15784.

It is an arithmetic number, because the mean of its divisors is an integer number (885360).

Almost surely, 2^15565225 is an apocalyptic number.

It is an amenable number.

15565225 is a deficient number, since it is larger than the sum of its proper divisors (5683415).

15565225 is a wasteful number, since it uses less digits than its factorization.

15565225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089 (or 1084 counting only the distinct ones).

The product of its digits is 15000, while the sum is 31.

The square root of 15565225 is about 3945.2788241137. The cubic root of 15565225 is about 249.6807926000.

The spelling of 15565225 in words is "fifteen million, five hundred sixty-five thousand, two hundred twenty-five".