161608771 has 2 divisors, whose sum is σ = 161608772. Its totient is φ = 161608770.

The previous prime is 161608747. The next prime is 161608789. The reversal of 161608771 is 177806161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161608771 is a prime.

It is a super-2 number, since 2×161608771² = 52234789728260882, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161608771.

It is not a weakly prime, because it can be changed into another prime (161608571) 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, 80804385 + 80804386.

It is an arithmetic number, because the mean of its divisors is an integer number (80804386).

Almost surely, 2^161608771 is an apocalyptic number.

161608771 is a deficient number, since it is larger than the sum of its proper divisors (1).

161608771 is an equidigital number, since it uses as much as digits as its factorization.

161608771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 161608771 is about 12712.5438445655. The cubic root of 161608771 is about 544.6969906134.

The spelling of 161608771 in words is "one hundred sixty-one million, six hundred eight thousand, seven hundred seventy-one".