252523309 has 4 divisors (see below), whose sum is σ = 252572320. Its totient is φ = 252474300.

The previous prime is 252523289. The next prime is 252523343. The reversal of 252523309 is 903325252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 252523309 - 2⁵ = 252523277 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 (252523379) 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, 15729 + ... + 27430.

It is an arithmetic number, because the mean of its divisors is an integer number (63143080).

Almost surely, 2^252523309 is an apocalyptic number.

It is an amenable number.

252523309 is a deficient number, since it is larger than the sum of its proper divisors (49011).

252523309 is an equidigital number, since it uses as much as digits as its factorization.

252523309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49010.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 252523309 is about 15890.9820023811. The cubic root of 252523309 is about 632.0728807223.

It can be divided in two parts, 25252 and 3309, that added together give a 4-th power (28561 = 13⁴).

The spelling of 252523309 in words is "two hundred fifty-two million, five hundred twenty-three thousand, three hundred nine".