252405581 has 2 divisors, whose sum is σ = 252405582. Its totient is φ = 252405580.

The previous prime is 252405577. The next prime is 252405583. The reversal of 252405581 is 185504252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243048100 + 9357481 = 15590^2 + 3059^2 .

It is a cyclic number.

It is not a de Polignac number, because 252405581 - 2² = 252405577 is a prime.

It is a super-2 number, since 2×252405581² = 127417154639895122, which contains 22 as substring.

Together with 252405583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252405583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126202790 + 126202791.

It is an arithmetic number, because the mean of its divisors is an integer number (126202791).

Almost surely, 2^252405581 is an apocalyptic number.

It is an amenable number.

252405581 is a deficient number, since it is larger than the sum of its proper divisors (1).

252405581 is an equidigital number, since it uses as much as digits as its factorization.

252405581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16000, while the sum is 32.

The square root of 252405581 is about 15887.2773312484. The cubic root of 252405581 is about 631.9746399654.

The spelling of 252405581 in words is "two hundred fifty-two million, four hundred five thousand, five hundred eighty-one".