252638513 has 8 divisors (see below), whose sum is σ = 268861032. Its totient is φ = 236567296.

The previous prime is 252638467. The next prime is 252638521. The reversal of 252638513 is 315836252.

It can be written as a sum of positive squares in 4 ways, for example, as 216913984 + 35724529 = 14728^2 + 5977^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252638513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (252638543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34370 + ... + 41067.

It is an arithmetic number, because the mean of its divisors is an integer number (33607629).

Almost surely, 2^252638513 is an apocalyptic number.

It is an amenable number.

252638513 is a deficient number, since it is larger than the sum of its proper divisors (16222519).

252638513 is a wasteful number, since it uses less digits than its factorization.

252638513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75651.

The product of its digits is 43200, while the sum is 35.

The square root of 252638513 is about 15894.6064122393. The cubic root of 252638513 is about 632.1689857167.

The spelling of 252638513 in words is "two hundred fifty-two million, six hundred thirty-eight thousand, five hundred thirteen".