161692291 has 2 divisors, whose sum is σ = 161692292. Its totient is φ = 161692290.

The previous prime is 161692283. The next prime is 161692319. The reversal of 161692291 is 192296161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161692291 - 2³ = 161692283 is a prime.

It is a super-2 number, since 2×161692291² = 52288793937657362, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161692291.

It is not a weakly prime, because it can be changed into another prime (161692991) 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, 80846145 + 80846146.

It is an arithmetic number, because the mean of its divisors is an integer number (80846146).

Almost surely, 2^161692291 is an apocalyptic number.

161692291 is a deficient number, since it is larger than the sum of its proper divisors (1).

161692291 is an equidigital number, since it uses as much as digits as its factorization.

161692291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 37.

The square root of 161692291 is about 12715.8283646800. The cubic root of 161692291 is about 544.7908082480.

The spelling of 161692291 in words is "one hundred sixty-one million, six hundred ninety-two thousand, two hundred ninety-one".