252566221 has 8 divisors (see below), whose sum is σ = 266011200. Its totient is φ = 239136480.

The previous prime is 252566201. The next prime is 252566231. The reversal of 252566221 is 122665252.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252566221 is a prime.

It is a super-3 number, since 3×252566221³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252566201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49416 + ... + 54286.

It is an arithmetic number, because the mean of its divisors is an integer number (33251400).

Almost surely, 2^252566221 is an apocalyptic number.

It is an amenable number.

252566221 is a deficient number, since it is larger than the sum of its proper divisors (13444979).

252566221 is a wasteful number, since it uses less digits than its factorization.

252566221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7619.

The product of its digits is 14400, while the sum is 31.

The square root of 252566221 is about 15892.3321447798. The cubic root of 252566221 is about 632.1086820051.

The spelling of 252566221 in words is "two hundred fifty-two million, five hundred sixty-six thousand, two hundred twenty-one".