161732689 has 2 divisors, whose sum is σ = 161732690. Its totient is φ = 161732688.

The previous prime is 161732663. The next prime is 161732699. The reversal of 161732689 is 986237161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120670225 + 41062464 = 10985^2 + 6408^2 .

It is a cyclic number.

It is not a de Polignac number, because 161732689 - 2⁵ = 161732657 is a prime.

It is not a weakly prime, because it can be changed into another prime (161732699) 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 as a sum of consecutive naturals, namely, 80866344 + 80866345.

It is an arithmetic number, because the mean of its divisors is an integer number (80866345).

Almost surely, 2^161732689 is an apocalyptic number.

It is an amenable number.

161732689 is a deficient number, since it is larger than the sum of its proper divisors (1).

161732689 is an equidigital number, since it uses as much as digits as its factorization.

161732689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 161732689 is about 12717.4167581313. The cubic root of 161732689 is about 544.8361755447.

The spelling of 161732689 in words is "one hundred sixty-one million, seven hundred thirty-two thousand, six hundred eighty-nine".