91159923 has 8 divisors (see below), whose sum is σ = 121829008. Its totient is φ = 60632064.

The previous prime is 91159919. The next prime is 91159949. The reversal of 91159923 is 32995119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91159923 - 2² = 91159919 is a prime.

It is a super-2 number, since 2×91159923² = 16620263122731858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91159903) 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 7 ways as a sum of consecutive naturals, for example, 33790 + ... + 36387.

It is an arithmetic number, because the mean of its divisors is an integer number (15228626).

Almost surely, 2^91159923 is an apocalyptic number.

91159923 is a deficient number, since it is larger than the sum of its proper divisors (30669085).

91159923 is a wasteful number, since it uses less digits than its factorization.

91159923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70613.

The product of its digits is 21870, while the sum is 39.

The square root of 91159923 is about 9547.7705774699. The cubic root of 91159923 is about 450.0574790776.

The spelling of 91159923 in words is "ninety-one million, one hundred fifty-nine thousand, nine hundred twenty-three".