161313161 has 2 divisors, whose sum is σ = 161313162. Its totient is φ = 161313160.

The previous prime is 161313151. The next prime is 161313193.

161313161 is nontrivially palindromic in base 10.

161313161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152646025 + 8667136 = 12355^2 + 2944^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 161313161 - 2¹⁴ = 161296777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161313101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80656580 + 80656581.

It is an arithmetic number, because the mean of its divisors is an integer number (80656581).

Almost surely, 2^161313161 is an apocalyptic number.

It is an amenable number.

161313161 is a deficient number, since it is larger than the sum of its proper divisors (1).

161313161 is an equidigital number, since it uses as much as digits as its factorization.

161313161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 23.

The square root of 161313161 is about 12700.9118176610. The cubic root of 161313161 is about 544.3646733497.

The spelling of 161313161 in words is "one hundred sixty-one million, three hundred thirteen thousand, one hundred sixty-one".