91158369 has 16 divisors (see below), whose sum is σ = 130027968. Its totient is φ = 56604672.

The previous prime is 91158359. The next prime is 91158373. The reversal of 91158369 is 96385119.

It is not a de Polignac number, because 91158369 - 2⁸ = 91158113 is a prime.

It is a super-2 number, since 2×91158369² = 16619696477480322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91158369.

It is not an unprimeable number, because it can be changed into a prime (91158359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4267 + ... + 14160.

It is an arithmetic number, because the mean of its divisors is an integer number (8126748).

Almost surely, 2^91158369 is an apocalyptic number.

It is an amenable number.

91158369 is a deficient number, since it is larger than the sum of its proper divisors (38869599).

91158369 is a wasteful number, since it uses less digits than its factorization.

91158369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18544.

The product of its digits is 58320, while the sum is 42.

The square root of 91158369 is about 9547.6891968685. The cubic root of 91158369 is about 450.0549216917.

The spelling of 91158369 in words is "ninety-one million, one hundred fifty-eight thousand, three hundred sixty-nine".