225188931 has 16 divisors (see below), whose sum is σ = 344787840. Its totient is φ = 129294720.

The previous prime is 225188923. The next prime is 225188941. The reversal of 225188931 is 139881522.

It is not a de Polignac number, because 225188931 - 2³ = 225188923 is a prime.

It is a super-2 number, since 2×225188931² = 101420109289845522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 225188931.

It is not an unprimeable number, because it can be changed into a prime (225188911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178950 + ... + 180203.

It is an arithmetic number, because the mean of its divisors is an integer number (21549240).

Almost surely, 2^225188931 is an apocalyptic number.

225188931 is a deficient number, since it is larger than the sum of its proper divisors (119598909).

225188931 is a wasteful number, since it uses less digits than its factorization.

225188931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359186.

The product of its digits is 34560, while the sum is 39.

The square root of 225188931 is about 15006.2963785206. The cubic root of 225188931 is about 608.3903914122.

The spelling of 225188931 in words is "two hundred twenty-five million, one hundred eighty-eight thousand, nine hundred thirty-one".