91857233399 has 16 divisors (see below), whose sum is σ = 94166115840. Its totient is φ = 89575130400.

The previous prime is 91857233393. The next prime is 91857233443. The reversal of 91857233399 is 99333275819.

It is a cyclic number.

It is not a de Polignac number, because 91857233399 - 2⁴ = 91857233383 is a prime.

It is a super-2 number, since 2×91857233399² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91857233393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6612449 + ... + 6626325.

It is an arithmetic number, because the mean of its divisors is an integer number (5885382240).

Almost surely, 2^91857233399 is an apocalyptic number.

91857233399 is a deficient number, since it is larger than the sum of its proper divisors (2308882441).

91857233399 is a wasteful number, since it uses less digits than its factorization.

91857233399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14830.

The product of its digits is 11022480, while the sum is 59.

The spelling of 91857233399 in words is "ninety-one billion, eight hundred fifty-seven million, two hundred thirty-three thousand, three hundred ninety-nine".