252043661 has 4 divisors (see below), whose sum is σ = 252331932. Its totient is φ = 251755392.

The previous prime is 252043651. The next prime is 252043663. The reversal of 252043661 is 166340252.

252043661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 97812100 + 154231561 = 9890^2 + 12419^2 .

It is a cyclic number.

It is not a de Polignac number, because 252043661 - 2²⁶ = 184934797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252043663) 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, 142820 + ... + 144573.

It is an arithmetic number, because the mean of its divisors is an integer number (63082983).

Almost surely, 2^252043661 is an apocalyptic number.

It is an amenable number.

252043661 is a deficient number, since it is larger than the sum of its proper divisors (288271).

252043661 is an equidigital number, since it uses as much as digits as its factorization.

252043661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288270.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 252043661 is about 15875.8829990650. The cubic root of 252043661 is about 631.6724363068.

The spelling of 252043661 in words is "two hundred fifty-two million, forty-three thousand, six hundred sixty-one".