91123904 has 28 divisors (see below), whose sum is σ = 181130448. Its totient is φ = 45484800.

The previous prime is 91123883. The next prime is 91123913. The reversal of 91123904 is 40932119.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65294 + ... + 66674.

Almost surely, 2^91123904 is an apocalyptic number.

It is an amenable number.

91123904 is a deficient number, since it is larger than the sum of its proper divisors (90006544).

91123904 is a wasteful number, since it uses less digits than its factorization.

91123904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424 (or 2414 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 91123904 is about 9545.8841392508. The cubic root of 91123904 is about 449.9981958775.

The spelling of 91123904 in words is "ninety-one million, one hundred twenty-three thousand, nine hundred four".