161797417 has 2 divisors, whose sum is σ = 161797418. Its totient is φ = 161797416.

The previous prime is 161797397. The next prime is 161797459. The reversal of 161797417 is 714797161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87216921 + 74580496 = 9339^2 + 8636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161797417 is a prime.

It is not a weakly prime, because it can be changed into another prime (161797477) 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, 80898708 + 80898709.

It is an arithmetic number, because the mean of its divisors is an integer number (80898709).

Almost surely, 2^161797417 is an apocalyptic number.

It is an amenable number.

161797417 is a deficient number, since it is larger than the sum of its proper divisors (1).

161797417 is an equidigital number, since it uses as much as digits as its factorization.

161797417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74088, while the sum is 43.

The square root of 161797417 is about 12719.9613600042. The cubic root of 161797417 is about 544.9088498910.

The spelling of 161797417 in words is "one hundred sixty-one million, seven hundred ninety-seven thousand, four hundred seventeen".