252991633 has 4 divisors (see below), whose sum is σ = 254077668. Its totient is φ = 251905600.

The previous prime is 252991597. The next prime is 252991649. The reversal of 252991633 is 336199252.

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 95413824 + 157577809 = 9768^2 + 12553^2 .

It is a cyclic number.

It is not a de Polignac number, because 252991633 - 2²⁵ = 219437201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252991663) 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, 542668 + ... + 543133.

It is an arithmetic number, because the mean of its divisors is an integer number (63519417).

Almost surely, 2^252991633 is an apocalyptic number.

It is an amenable number.

252991633 is a deficient number, since it is larger than the sum of its proper divisors (1086035).

252991633 is a wasteful number, since it uses less digits than its factorization.

252991633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086034.

The product of its digits is 87480, while the sum is 40.

The square root of 252991633 is about 15905.7107040207. The cubic root of 252991633 is about 632.4633820917.

The spelling of 252991633 in words is "two hundred fifty-two million, nine hundred ninety-one thousand, six hundred thirty-three".