252638813 has 4 divisors (see below), whose sum is σ = 288730080. Its totient is φ = 216547548.

The previous prime is 252638797. The next prime is 252638833. The reversal of 252638813 is 318836252.

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 not a de Polignac number, because 252638813 - 2⁴ = 252638797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252638833) 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, 18045623 + ... + 18045636.

It is an arithmetic number, because the mean of its divisors is an integer number (72182520).

Almost surely, 2^252638813 is an apocalyptic number.

It is an amenable number.

252638813 is a deficient number, since it is larger than the sum of its proper divisors (36091267).

252638813 is an equidigital number, since it uses as much as digits as its factorization.

252638813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36091266.

The product of its digits is 69120, while the sum is 38.

The square root of 252638813 is about 15894.6158494001. The cubic root of 252638813 is about 632.1692359432.

The spelling of 252638813 in words is "two hundred fifty-two million, six hundred thirty-eight thousand, eight hundred thirteen".