252005581 has 4 divisors (see below), whose sum is σ = 252058972. Its totient is φ = 251952192.

The previous prime is 252005573. The next prime is 252005599. The reversal of 252005581 is 185500252.

252005581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 245548900 + 6456681 = 15670^2 + 2541^2 .

It is a cyclic number.

It is not a de Polignac number, because 252005581 - 2³ = 252005573 is a prime.

It is a super-2 number, since 2×252005581² = 127013625710295122, which contains 22 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 (252005521) 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, 18846 + ... + 29311.

It is an arithmetic number, because the mean of its divisors is an integer number (63014743).

Almost surely, 2^252005581 is an apocalyptic number.

It is an amenable number.

252005581 is a deficient number, since it is larger than the sum of its proper divisors (53391).

252005581 is an equidigital number, since it uses as much as digits as its factorization.

252005581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53390.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 252005581 is about 15874.6836503913. The cubic root of 252005581 is about 631.6406226417.

The spelling of 252005581 in words is "two hundred fifty-two million, five thousand, five hundred eighty-one".