252045309 has 4 divisors (see below), whose sum is σ = 336060416. Its totient is φ = 168030204.

The previous prime is 252045307. The next prime is 252045329. The reversal of 252045309 is 903540252.

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 not a de Polignac number, because 252045309 - 2¹ = 252045307 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252045307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42007549 + ... + 42007554.

It is an arithmetic number, because the mean of its divisors is an integer number (84015104).

Almost surely, 2^252045309 is an apocalyptic number.

It is an amenable number.

252045309 is a deficient number, since it is larger than the sum of its proper divisors (84015107).

252045309 is an equidigital number, since it uses as much as digits as its factorization.

252045309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84015106.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 252045309 is about 15875.9349016050. The cubic root of 252045309 is about 631.6738130443.

The spelling of 252045309 in words is "two hundred fifty-two million, forty-five thousand, three hundred nine".