252644257 has 4 divisors (see below), whose sum is σ = 252734656. Its totient is φ = 252553860.

The previous prime is 252644209. The next prime is 252644261. The reversal of 252644257 is 752446252.

252644257 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 252644257 - 2¹⁹ = 252119969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252644267) 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, 40869 + ... + 46642.

It is an arithmetic number, because the mean of its divisors is an integer number (63183664).

Almost surely, 2^252644257 is an apocalyptic number.

It is an amenable number.

252644257 is a deficient number, since it is larger than the sum of its proper divisors (90399).

252644257 is an equidigital number, since it uses as much as digits as its factorization.

252644257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90398.

The product of its digits is 134400, while the sum is 37.

The square root of 252644257 is about 15894.7871014367. The cubic root of 252644257 is about 632.1737766874.

The spelling of 252644257 in words is "two hundred fifty-two million, six hundred forty-four thousand, two hundred fifty-seven".