252990161 has 4 divisors (see below), whose sum is σ = 253364532. Its totient is φ = 252615792.

The previous prime is 252990139. The next prime is 252990193. The reversal of 252990161 is 161099252.

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

It can be written as a sum of positive squares in 2 ways, for example, as 223353025 + 29637136 = 14945^2 + 5444^2 .

It is a cyclic number.

It is not a de Polignac number, because 252990161 - 2⁶ = 252990097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252990061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186170 + ... + 187523.

It is an arithmetic number, because the mean of its divisors is an integer number (63341133).

Almost surely, 2^252990161 is an apocalyptic number.

It is an amenable number.

252990161 is a deficient number, since it is larger than the sum of its proper divisors (374371).

252990161 is an equidigital number, since it uses as much as digits as its factorization.

252990161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374370.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 252990161 is about 15905.6644312647. The cubic root of 252990161 is about 632.4621554531.

The spelling of 252990161 in words is "two hundred fifty-two million, nine hundred ninety thousand, one hundred sixty-one".