161795791 has 2 divisors, whose sum is σ = 161795792. Its totient is φ = 161795790.

The previous prime is 161795771. The next prime is 161795807. The reversal of 161795791 is 197597161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161795791 - 2¹⁵ = 161763023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161795701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80897895 + 80897896.

It is an arithmetic number, because the mean of its divisors is an integer number (80897896).

Almost surely, 2^161795791 is an apocalyptic number.

161795791 is a deficient number, since it is larger than the sum of its proper divisors (1).

161795791 is an equidigital number, since it uses as much as digits as its factorization.

161795791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 119070, while the sum is 46.

The square root of 161795791 is about 12719.8974445551. The cubic root of 161795791 is about 544.9070245121.

The spelling of 161795791 in words is "one hundred sixty-one million, seven hundred ninety-five thousand, seven hundred ninety-one".