161760961 has 2 divisors, whose sum is σ = 161760962. Its totient is φ = 161760960.

The previous prime is 161760947. The next prime is 161760997. The reversal of 161760961 is 169067161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152670736 + 9090225 = 12356^2 + 3015^2 .

It is an emirp because it is prime and its reverse (169067161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161760961 - 2²³ = 153372353 is a prime.

It is equal to p_9067636 and since 161760961 and 9067636 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161760961.

It is not a weakly prime, because it can be changed into another prime (161760061) 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, 80880480 + 80880481.

It is an arithmetic number, because the mean of its divisors is an integer number (80880481).

Almost surely, 2^161760961 is an apocalyptic number.

It is an amenable number.

161760961 is a deficient number, since it is larger than the sum of its proper divisors (1).

161760961 is an equidigital number, since it uses as much as digits as its factorization.

161760961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 161760961 is about 12718.5282560523. The cubic root of 161760961 is about 544.8679207472.

The spelling of 161760961 in words is "one hundred sixty-one million, seven hundred sixty thousand, nine hundred sixty-one".