252765221 has 2 divisors, whose sum is σ = 252765222. Its totient is φ = 252765220.

The previous prime is 252765217. The next prime is 252765259. The reversal of 252765221 is 122567252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241802500 + 10962721 = 15550^2 + 3311^2 .

It is a cyclic number.

It is not a de Polignac number, because 252765221 - 2² = 252765217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252765281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126382610 + 126382611.

It is an arithmetic number, because the mean of its divisors is an integer number (126382611).

Almost surely, 2^252765221 is an apocalyptic number.

It is an amenable number.

252765221 is a deficient number, since it is larger than the sum of its proper divisors (1).

252765221 is an equidigital number, since it uses as much as digits as its factorization.

252765221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 32.

The square root of 252765221 is about 15898.5917929859. The cubic root of 252765221 is about 632.2746537974.

The spelling of 252765221 in words is "two hundred fifty-two million, seven hundred sixty-five thousand, two hundred twenty-one".