161617769 has 2 divisors, whose sum is σ = 161617770. Its totient is φ = 161617768.

The previous prime is 161617763. The next prime is 161617789. The reversal of 161617769 is 967716161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144312169 + 17305600 = 12013^2 + 4160^2 .

It is a cyclic number.

It is not a de Polignac number, because 161617769 - 2¹⁶ = 161552233 is a prime.

It is a super-2 number, since 2×161617769² = 52240606513074722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161617763) 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, 80808884 + 80808885.

It is an arithmetic number, because the mean of its divisors is an integer number (80808885).

Almost surely, 2^161617769 is an apocalyptic number.

It is an amenable number.

161617769 is a deficient number, since it is larger than the sum of its proper divisors (1).

161617769 is an equidigital number, since it uses as much as digits as its factorization.

161617769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 44.

The square root of 161617769 is about 12712.8977420571. The cubic root of 161617769 is about 544.7070995791.

The spelling of 161617769 in words is "one hundred sixty-one million, six hundred seventeen thousand, seven hundred sixty-nine".