91331715375 has 64 divisors (see below), whose sum is σ = 169226703360. Its totient is φ = 48605104800.

The previous prime is 91331715373. The next prime is 91331715421. The reversal of 91331715375 is 57351713319.

91331715375 is a `hidden beast` number, since 9 + 13 + 31 + 71 + 537 + 5 = 666.

It is not a de Polignac number, because 91331715375 - 2¹ = 91331715373 is a prime.

It is a super-2 number, since 2×91331715375² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 91331715375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91331715373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1547152 + ... + 1605098.

It is an arithmetic number, because the mean of its divisors is an integer number (2644167240).

Almost surely, 2^91331715375 is an apocalyptic number.

91331715375 is a deficient number, since it is larger than the sum of its proper divisors (77894987985).

91331715375 is a wasteful number, since it uses less digits than its factorization.

91331715375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58438 (or 58422 counting only the distinct ones).

The product of its digits is 297675, while the sum is 45.

The spelling of 91331715375 in words is "ninety-one billion, three hundred thirty-one million, seven hundred fifteen thousand, three hundred seventy-five".