252565381 has 4 divisors (see below), whose sum is σ = 252952812. Its totient is φ = 252177952.

The previous prime is 252565351. The next prime is 252565471. The reversal of 252565381 is 183565252.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 142420356 + 110145025 = 11934^2 + 10495^2 .

It is a cyclic number.

It is not a de Polignac number, because 252565381 - 2²³ = 244176773 is a prime.

It is a super-2 number, since 2×252565381² = 127578543359350322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 252565381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252565301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192736 + ... + 194041.

It is an arithmetic number, because the mean of its divisors is an integer number (63238203).

Almost surely, 2^252565381 is an apocalyptic number.

It is an amenable number.

252565381 is a deficient number, since it is larger than the sum of its proper divisors (387431).

252565381 is an equidigital number, since it uses as much as digits as its factorization.

252565381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387430.

The product of its digits is 72000, while the sum is 37.

The square root of 252565381 is about 15892.3057169185. The cubic root of 252565381 is about 632.1079812359.

The spelling of 252565381 in words is "two hundred fifty-two million, five hundred sixty-five thousand, three hundred eighty-one".