161717713 has 4 divisors (see below), whose sum is σ = 166088500. Its totient is φ = 157346928.

The previous prime is 161717687. The next prime is 161717723. The reversal of 161717713 is 317717161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 317717161 = 5647 ⋅56263.

It can be written as a sum of positive squares in 2 ways, for example, as 147064129 + 14653584 = 12127^2 + 3828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161717713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161717723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2185338 + ... + 2185411.

It is an arithmetic number, because the mean of its divisors is an integer number (41522125).

Almost surely, 2^161717713 is an apocalyptic number.

It is an amenable number.

161717713 is a deficient number, since it is larger than the sum of its proper divisors (4370787).

161717713 is an equidigital number, since it uses as much as digits as its factorization.

161717713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4370786.

The product of its digits is 6174, while the sum is 34.

The square root of 161717713 is about 12716.8279456789. The cubic root of 161717713 is about 544.8193582510.

The spelling of 161717713 in words is "one hundred sixty-one million, seven hundred seventeen thousand, seven hundred thirteen".