252137681 has 4 divisors (see below), whose sum is σ = 258001392. Its totient is φ = 246273972.

The previous prime is 252137653. The next prime is 252137701. The reversal of 252137681 is 186731252.

It is a happy number.

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 252137681 - 2¹⁴ = 252121297 is a prime.

It is a super-2 number, since 2×252137681² = 127146820360115522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (272137681) 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, 2931791 + ... + 2931876.

It is an arithmetic number, because the mean of its divisors is an integer number (64500348).

Almost surely, 2^252137681 is an apocalyptic number.

It is an amenable number.

252137681 is a deficient number, since it is larger than the sum of its proper divisors (5863711).

252137681 is an equidigital number, since it uses as much as digits as its factorization.

252137681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5863710.

The product of its digits is 20160, while the sum is 35.

The square root of 252137681 is about 15878.8438181122. The cubic root of 252137681 is about 631.7509709265.

The spelling of 252137681 in words is "two hundred fifty-two million, one hundred thirty-seven thousand, six hundred eighty-one".