252045691 has 4 divisors (see below), whose sum is σ = 252732832. Its totient is φ = 251358552.

The previous prime is 252045683. The next prime is 252045763. The reversal of 252045691 is 196540252.

It is a happy number.

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 252045691 - 2³ = 252045683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252045611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343020 + ... + 343753.

It is an arithmetic number, because the mean of its divisors is an integer number (63183208).

Almost surely, 2^252045691 is an apocalyptic number.

252045691 is a deficient number, since it is larger than the sum of its proper divisors (687141).

252045691 is an equidigital number, since it uses as much as digits as its factorization.

252045691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687140.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 252045691 is about 15875.9469323880. The cubic root of 252045691 is about 631.6741321659.

The spelling of 252045691 in words is "two hundred fifty-two million, forty-five thousand, six hundred ninety-one".