252161309 has 4 divisors (see below), whose sum is σ = 252208800. Its totient is φ = 252113820.

The previous prime is 252161303. The next prime is 252161317. The reversal of 252161309 is 903161252.

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 a de Polignac number, because none of the positive numbers 2^k-252161309 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 (252161303) 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, 14609 + ... + 26790.

It is an arithmetic number, because the mean of its divisors is an integer number (63052200).

Almost surely, 2^252161309 is an apocalyptic number.

It is an amenable number.

252161309 is a deficient number, since it is larger than the sum of its proper divisors (47491).

252161309 is an equidigital number, since it uses as much as digits as its factorization.

252161309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47490.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 252161309 is about 15879.5878095119. The cubic root of 252161309 is about 631.7707042532.

The spelling of 252161309 in words is "two hundred fifty-two million, one hundred sixty-one thousand, three hundred nine".