91915797323 has 4 divisors (see below), whose sum is σ = 105046625520. Its totient is φ = 78784969128.

The previous prime is 91915797287. The next prime is 91915797329. The reversal of 91915797323 is 32379751919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32379751919 = 83 ⋅390117493.

It is a cyclic number.

It is not a de Polignac number, because 91915797323 - 2²⁰ = 91914748747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91915797329) 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, 6565414088 + ... + 6565414101.

It is an arithmetic number, because the mean of its divisors is an integer number (26261656380).

Almost surely, 2^91915797323 is an apocalyptic number.

91915797323 is a deficient number, since it is larger than the sum of its proper divisors (13130828197).

91915797323 is a wasteful number, since it uses less digits than its factorization.

91915797323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13130828196.

The product of its digits is 3214890, while the sum is 56.

The spelling of 91915797323 in words is "ninety-one billion, nine hundred fifteen million, seven hundred ninety-seven thousand, three hundred twenty-three".