252315661 has 8 divisors (see below), whose sum is σ = 272785464. Its totient is φ = 231997440.

The previous prime is 252315659. The next prime is 252315677. The reversal of 252315661 is 166513252.

It can be written as a sum of positive squares in 4 ways, for example, as 78234025 + 174081636 = 8845^2 + 13194^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 252315661 - 2¹ = 252315659 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 (252355661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34420 + ... + 41101.

It is an arithmetic number, because the mean of its divisors is an integer number (34098183).

Almost surely, 2^252315661 is an apocalyptic number.

It is an amenable number.

252315661 is a deficient number, since it is larger than the sum of its proper divisors (20469803).

252315661 is a wasteful number, since it uses less digits than its factorization.

252315661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75791.

The product of its digits is 10800, while the sum is 31.

The square root of 252315661 is about 15884.4471417799. The cubic root of 252315661 is about 631.8995836361.

The spelling of 252315661 in words is "two hundred fifty-two million, three hundred fifteen thousand, six hundred sixty-one".