91717671719 has 4 divisors (see below), whose sum is σ = 91734621096. Its totient is φ = 91700722344.

The previous prime is 91717671707. The next prime is 91717671733.

91717671719 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91717671719 is a prime.

It is a super-2 number, since 2×91717671719² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91717676719) 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, 8466569 + ... + 8477394.

It is an arithmetic number, because the mean of its divisors is an integer number (22933655274).

Almost surely, 2^91717671719 is an apocalyptic number.

91717671719 is a deficient number, since it is larger than the sum of its proper divisors (16949377).

91717671719 is a wasteful number, since it uses less digits than its factorization.

91717671719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16949376.

The product of its digits is 1166886, while the sum is 56.

The spelling of 91717671719 in words is "ninety-one billion, seven hundred seventeen million, six hundred seventy-one thousand, seven hundred nineteen".