225171620 has 12 divisors (see below), whose sum is σ = 472860444. Its totient is φ = 90068640.

The previous prime is 225171599. The next prime is 225171637. The reversal of 225171620 is 26171522.

It can be written as a sum of positive squares in 2 ways, for example, as 102050404 + 123121216 = 10102^2 + 11096^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 225171620.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5629271 + ... + 5629310.

It is an arithmetic number, because the mean of its divisors is an integer number (39405037).

Almost surely, 2^225171620 is an apocalyptic number.

225171620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225171620 is an abundant number, since it is smaller than the sum of its proper divisors (247688824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

225171620 is a wasteful number, since it uses less digits than its factorization.

225171620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11258590 (or 11258588 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 225171620 is about 15005.7195762149. The cubic root of 225171620 is about 608.3748013683.

The spelling of 225171620 in words is "two hundred twenty-five million, one hundred seventy-one thousand, six hundred twenty".