161694719 has 2 divisors, whose sum is σ = 161694720. Its totient is φ = 161694718.

The previous prime is 161694703. The next prime is 161694779. The reversal of 161694719 is 917496161.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161694719 - 2⁴ = 161694703 is a prime.

It is a super-2 number, since 2×161694719² = 52290364304977922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161694719.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161694779) 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, 80847359 + 80847360.

It is an arithmetic number, because the mean of its divisors is an integer number (80847360).

Almost surely, 2^161694719 is an apocalyptic number.

161694719 is a deficient number, since it is larger than the sum of its proper divisors (1).

161694719 is an equidigital number, since it uses as much as digits as its factorization.

161694719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 161694719 is about 12715.9238358839. The cubic root of 161694719 is about 544.7935351260.

The spelling of 161694719 in words is "one hundred sixty-one million, six hundred ninety-four thousand, seven hundred nineteen".