91610138 has 16 divisors (see below), whose sum is σ = 139536000. Its totient is φ = 45101472.

The previous prime is 91610111. The next prime is 91610149. The reversal of 91610138 is 83101619.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 91610138.

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, 89393 + ... + 90411.

It is an arithmetic number, because the mean of its divisors is an integer number (8721000).

Almost surely, 2^91610138 is an apocalyptic number.

91610138 is a deficient number, since it is larger than the sum of its proper divisors (47925862).

91610138 is a wasteful number, since it uses less digits than its factorization.

91610138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 91610138 is about 9571.3185089621. The cubic root of 91610138 is about 450.7971680651.

The spelling of 91610138 in words is "ninety-one million, six hundred ten thousand, one hundred thirty-eight".