91216967759 has 4 divisors (see below), whose sum is σ = 92763018120. Its totient is φ = 89670917400.

The previous prime is 91216967707. The next prime is 91216967773. The reversal of 91216967759 is 95776961219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95776961219 = 521 ⋅183832939.

It is a cyclic number.

It is not a de Polignac number, because 91216967759 - 2²⁰ = 91215919183 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 (91216967789) 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, 773025092 + ... + 773025209.

It is an arithmetic number, because the mean of its divisors is an integer number (23190754530).

Almost surely, 2^91216967759 is an apocalyptic number.

91216967759 is a deficient number, since it is larger than the sum of its proper divisors (1546050361).

91216967759 is a wasteful number, since it uses less digits than its factorization.

91216967759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546050360.

The product of its digits is 12859560, while the sum is 62.

The spelling of 91216967759 in words is "ninety-one billion, two hundred sixteen million, nine hundred sixty-seven thousand, seven hundred fifty-nine".