91937138 has 16 divisors (see below), whose sum is σ = 139416984. Its totient is φ = 45467520.

The previous prime is 91937117. The next prime is 91937161. The reversal of 91937138 is 83173919.

It can be written as a sum of positive squares in 4 ways, for example, as 52461049 + 39476089 = 7243^2 + 6283^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91937095 and 91937104.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114956 + ... + 115752.

Almost surely, 2^91937138 is an apocalyptic number.

91937138 is a deficient number, since it is larger than the sum of its proper divisors (47479846).

91937138 is a wasteful number, since it uses less digits than its factorization.

91937138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357.

The product of its digits is 40824, while the sum is 41.

The square root of 91937138 is about 9588.3855783964. The cubic root of 91937138 is about 451.3329007228.

The spelling of 91937138 in words is "ninety-one million, nine hundred thirty-seven thousand, one hundred thirty-eight".