161191673 has 2 divisors, whose sum is σ = 161191674. Its totient is φ = 161191672.

The previous prime is 161191651. The next prime is 161191691. The reversal of 161191673 is 376191161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154678969 + 6512704 = 12437^2 + 2552^2 .

It is a cyclic number.

It is not a de Polignac number, because 161191673 - 2⁸ = 161191417 is a prime.

It is not a weakly prime, because it can be changed into another prime (161191633) 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, 80595836 + 80595837.

It is an arithmetic number, because the mean of its divisors is an integer number (80595837).

Almost surely, 2^161191673 is an apocalyptic number.

It is an amenable number.

161191673 is a deficient number, since it is larger than the sum of its proper divisors (1).

161191673 is an equidigital number, since it uses as much as digits as its factorization.

161191673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 35.

The square root of 161191673 is about 12696.1282680981. The cubic root of 161191673 is about 544.2279819102.

The spelling of 161191673 in words is "one hundred sixty-one million, one hundred ninety-one thousand, six hundred seventy-three".