252117161 has 2 divisors, whose sum is σ = 252117162. Its totient is φ = 252117160.

The previous prime is 252117143. The next prime is 252117197. The reversal of 252117161 is 161711252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190964761 + 61152400 = 13819^2 + 7820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252117161 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 252117161.

It is not a weakly prime, because it can be changed into another prime (252117101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126058580 + 126058581.

It is an arithmetic number, because the mean of its divisors is an integer number (126058581).

Almost surely, 2^252117161 is an apocalyptic number.

It is an amenable number.

252117161 is a deficient number, since it is larger than the sum of its proper divisors (1).

252117161 is an equidigital number, since it uses as much as digits as its factorization.

252117161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 26.

The square root of 252117161 is about 15878.1976622034. The cubic root of 252117161 is about 631.7338322987.

The spelling of 252117161 in words is "two hundred fifty-two million, one hundred seventeen thousand, one hundred sixty-one".