252645691 has 4 divisors (see below), whose sum is σ = 260795584. Its totient is φ = 244495800.

The previous prime is 252645689. The next prime is 252645697. The reversal of 252645691 is 196546252.

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 252645691 - 2¹ = 252645689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252645697) 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, 4074900 + ... + 4074961.

It is an arithmetic number, because the mean of its divisors is an integer number (65198896).

Almost surely, 2^252645691 is an apocalyptic number.

252645691 is a deficient number, since it is larger than the sum of its proper divisors (8149893).

252645691 is an equidigital number, since it uses as much as digits as its factorization.

252645691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8149892.

The product of its digits is 129600, while the sum is 40.

The square root of 252645691 is about 15894.8322105016. The cubic root of 252645691 is about 632.1749727505.

The spelling of 252645691 in words is "two hundred fifty-two million, six hundred forty-five thousand, six hundred ninety-one".