161717111 has 4 divisors (see below), whose sum is σ = 166933824. Its totient is φ = 156500400.

The previous prime is 161717099. The next prime is 161717123. The reversal of 161717111 is 111717161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111717161 = 89 ⋅1255249.

It is an interprime number because it is at equal distance from previous prime (161717099) and next prime (161717123).

It is a de Polignac number, because none of the positive numbers 2^k-161717111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161717191) 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 in 3 ways as a sum of consecutive naturals, for example, 2608310 + ... + 2608371.

It is an arithmetic number, because the mean of its divisors is an integer number (41733456).

Almost surely, 2^161717111 is an apocalyptic number.

161717111 is a deficient number, since it is larger than the sum of its proper divisors (5216713).

161717111 is an equidigital number, since it uses as much as digits as its factorization.

161717111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5216712.

The product of its digits is 294, while the sum is 26.

The square root of 161717111 is about 12716.8042762323. The cubic root of 161717111 is about 544.8186822136.

The spelling of 161717111 in words is "one hundred sixty-one million, seven hundred seventeen thousand, one hundred eleven".