91431536369279 has 4 divisors (see below), whose sum is σ = 94380940768320. Its totient is φ = 88482131970240.

The previous prime is 91431536369269. The next prime is 91431536369321. The reversal of 91431536369279 is 97296363513419.

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

It is a cyclic number.

It is not a de Polignac number, because 91431536369279 - 2²⁰ = 91431535320703 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 (91431536369269) 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, 1474702199474 + ... + 1474702199535.

It is an arithmetic number, because the mean of its divisors is an integer number (23595235192080).

Almost surely, 2^{91431536369279} is an apocalyptic number.

91431536369279 is a deficient number, since it is larger than the sum of its proper divisors (2949404399041).

91431536369279 is a wasteful number, since it uses less digits than its factorization.

91431536369279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2949404399040.

The product of its digits is 198404640, while the sum is 68.

The spelling of 91431536369279 in words is "ninety-one trillion, four hundred thirty-one billion, five hundred thirty-six million, three hundred sixty-nine thousand, two hundred seventy-nine".