161117161 has 2 divisors, whose sum is σ = 161117162. Its totient is φ = 161117160.

The previous prime is 161117123. The next prime is 161117171. The reversal of 161117161 is 161711161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160909225 + 207936 = 12685^2 + 456^2 .

It is a cyclic number.

It is not a de Polignac number, because 161117161 - 2²³ = 152728553 is a prime.

It is not a weakly prime, because it can be changed into another prime (161117101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80558580 + 80558581.

It is an arithmetic number, because the mean of its divisors is an integer number (80558581).

Almost surely, 2^161117161 is an apocalyptic number.

It is an amenable number.

161117161 is a deficient number, since it is larger than the sum of its proper divisors (1).

161117161 is an equidigital number, since it uses as much as digits as its factorization.

161117161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252, while the sum is 25.

The square root of 161117161 is about 12693.1934910014. The cubic root of 161117161 is about 544.1441112308.

The spelling of 161117161 in words is "one hundred sixty-one million, one hundred seventeen thousand, one hundred sixty-one".