91138604 has 12 divisors (see below), whose sum is σ = 166427184. Its totient is φ = 43587984.

The previous prime is 91138603. The next prime is 91138631. The reversal of 91138604 is 40683119.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (91138601) 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, 495227 + ... + 495410.

It is an arithmetic number, because the mean of its divisors is an integer number (13868932).

Almost surely, 2^91138604 is an apocalyptic number.

It is an amenable number.

91138604 is a deficient number, since it is larger than the sum of its proper divisors (75288580).

91138604 is a wasteful number, since it uses less digits than its factorization.

91138604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990664 (or 990662 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 91138604 is about 9546.6540735485. The cubic root of 91138604 is about 450.0223923014.

The spelling of 91138604 in words is "ninety-one million, one hundred thirty-eight thousand, six hundred four".