188172225 has 36 divisors (see below), whose sum is σ = 338399100. Its totient is φ = 99953280.

The previous prime is 188172209. The next prime is 188172227. The reversal of 188172225 is 522271881.

It can be written as a sum of positive squares in 6 ways, for example, as 56565441 + 131606784 = 7521^2 + 11472^2 .

It is not a de Polignac number, because 188172225 - 2⁴ = 188172209 is a prime.

It is a super-2 number, since 2×188172225² = 70817572522901250, 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 188172225.

It is not an unprimeable number, because it can be changed into a prime (188172227) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 58971 + ... + 62079.

It is an arithmetic number, because the mean of its divisors is an integer number (9399975).

Almost surely, 2^188172225 is an apocalyptic number.

188172225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

188172225 is a deficient number, since it is larger than the sum of its proper divisors (150226875).

188172225 is a wasteful number, since it uses less digits than its factorization.

188172225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3394 (or 3386 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 188172225 is about 13717.5881626473. The cubic root of 188172225 is about 573.0403103865.

The spelling of 188172225 in words is "one hundred eighty-eight million, one hundred seventy-two thousand, two hundred twenty-five".