225521985 has 16 divisors (see below), whose sum is σ = 388592064. Its totient is φ = 111026112.

The previous prime is 225521957. The next prime is 225521987. The reversal of 225521985 is 589125522.

It is not a de Polignac number, because 225521985 - 2⁵ = 225521953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (225521987) 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, 578067 + ... + 578456.

It is an arithmetic number, because the mean of its divisors is an integer number (24287004).

Almost surely, 2^225521985 is an apocalyptic number.

It is an amenable number.

225521985 is a deficient number, since it is larger than the sum of its proper divisors (163070079).

225521985 is a wasteful number, since it uses less digits than its factorization.

225521985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156544.

The product of its digits is 72000, while the sum is 39.

The square root of 225521985 is about 15017.3894202688. The cubic root of 225521985 is about 608.6901797419.

The spelling of 225521985 in words is "two hundred twenty-five million, five hundred twenty-one thousand, nine hundred eighty-five".