252553221 has 10 divisors (see below), whose sum is σ = 377270982. Its totient is φ = 168368760.

The previous prime is 252553181. The next prime is 252553247. The reversal of 252553221 is 122355252.

It can be written as a sum of positive squares in only one way, i.e., 215208900 + 37344321 = 14670^2 + 6111^2 .

It is not a de Polignac number, because 252553221 - 2²² = 248358917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252553261) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1558890 + ... + 1559051.

Almost surely, 2^252553221 is an apocalyptic number.

It is an amenable number.

252553221 is a deficient number, since it is larger than the sum of its proper divisors (124717761).

252553221 is an equidigital number, since it uses as much as digits as its factorization.

252553221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117953 (or 3117944 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 252553221 is about 15891.9231372418. The cubic root of 252553221 is about 632.0978365935.

The spelling of 252553221 in words is "two hundred fifty-two million, five hundred fifty-three thousand, two hundred twenty-one".