252217131 has 4 divisors (see below), whose sum is σ = 336289512. Its totient is φ = 168144752.

The previous prime is 252217129. The next prime is 252217139. The reversal of 252217131 is 131712252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 252217131 - 2¹ = 252217129 is a prime.

It is a super-2 number, since 2×252217131² = 127226962339742322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (252217139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42036186 + ... + 42036191.

It is an arithmetic number, because the mean of its divisors is an integer number (84072378).

Almost surely, 2^252217131 is an apocalyptic number.

252217131 is a deficient number, since it is larger than the sum of its proper divisors (84072381).

252217131 is an equidigital number, since it uses as much as digits as its factorization.

252217131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84072380.

The product of its digits is 840, while the sum is 24.

The square root of 252217131 is about 15881.3453775176. The cubic root of 252217131 is about 631.8173200516.

Adding to 252217131 its reverse (131712252), we get a palindrome (383929383).

The spelling of 252217131 in words is "two hundred fifty-two million, two hundred seventeen thousand, one hundred thirty-one".