161190317 has 2 divisors, whose sum is σ = 161190318. Its totient is φ = 161190316.

The previous prime is 161190313. The next prime is 161190329. The reversal of 161190317 is 713091161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92813956 + 68376361 = 9634^2 + 8269^2 .

It is a cyclic number.

It is not a de Polignac number, because 161190317 - 2² = 161190313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161190317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161190313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80595158 + 80595159.

It is an arithmetic number, because the mean of its divisors is an integer number (80595159).

Almost surely, 2^161190317 is an apocalyptic number.

It is an amenable number.

161190317 is a deficient number, since it is larger than the sum of its proper divisors (1).

161190317 is an equidigital number, since it uses as much as digits as its factorization.

161190317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 161190317 is about 12696.0748658788. The cubic root of 161190317 is about 544.2264558280.

The spelling of 161190317 in words is "one hundred sixty-one million, one hundred ninety thousand, three hundred seventeen".