91318863 has 4 divisors (see below), whose sum is σ = 121758488. Its totient is φ = 60879240.

The previous prime is 91318859. The next prime is 91318889. The reversal of 91318863 is 36881319.

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

It is not a de Polignac number, because 91318863 - 2² = 91318859 is a prime.

It is a super-2 number, since 2×91318863² = 16678269479225538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91308863) 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, 15219808 + ... + 15219813.

It is an arithmetic number, because the mean of its divisors is an integer number (30439622).

Almost surely, 2^91318863 is an apocalyptic number.

91318863 is a deficient number, since it is larger than the sum of its proper divisors (30439625).

91318863 is a wasteful number, since it uses less digits than its factorization.

91318863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30439624.

The product of its digits is 31104, while the sum is 39.

The square root of 91318863 is about 9556.0903616490. The cubic root of 91318863 is about 450.3188900164.

The spelling of 91318863 in words is "ninety-one million, three hundred eighteen thousand, eight hundred sixty-three".