161197711 has 2 divisors, whose sum is σ = 161197712. Its totient is φ = 161197710.

The previous prime is 161197693. The next prime is 161197721. The reversal of 161197711 is 117791161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161197711 - 2⁵ = 161197679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161197721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80598855 + 80598856.

It is an arithmetic number, because the mean of its divisors is an integer number (80598856).

Almost surely, 2^161197711 is an apocalyptic number.

161197711 is a deficient number, since it is larger than the sum of its proper divisors (1).

161197711 is an equidigital number, since it uses as much as digits as its factorization.

161197711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2646, while the sum is 34.

The square root of 161197711 is about 12696.3660548993. The cubic root of 161197711 is about 544.2347771486.

The spelling of 161197711 in words is "one hundred sixty-one million, one hundred ninety-seven thousand, seven hundred eleven".