252502391 has 4 divisors (see below), whose sum is σ = 261209400. Its totient is φ = 243795384.

The previous prime is 252502373. The next prime is 252502399. The reversal of 252502391 is 193205252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252502391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 8706979 = 252502391 / (2 + 5 + 2 + 5 + 0 + 2 + 3 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252502399) 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, 4353461 + ... + 4353518.

It is an arithmetic number, because the mean of its divisors is an integer number (65302350).

Almost surely, 2^252502391 is an apocalyptic number.

252502391 is a deficient number, since it is larger than the sum of its proper divisors (8707009).

252502391 is an equidigital number, since it uses as much as digits as its factorization.

252502391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8707008.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 252502391 is about 15890.3238167131. The cubic root of 252502391 is about 632.0554274613.

The spelling of 252502391 in words is "two hundred fifty-two million, five hundred two thousand, three hundred ninety-one".