91173889 has 8 divisors (see below), whose sum is σ = 94260320. Its totient is φ = 88131456.

The previous prime is 91173881. The next prime is 91173893. The reversal of 91173889 is 98837119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91173889 - 2³ = 91173881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91173881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6759 + ... + 15100.

It is an arithmetic number, because the mean of its divisors is an integer number (11782540).

Almost surely, 2^91173889 is an apocalyptic number.

It is an amenable number.

91173889 is a deficient number, since it is larger than the sum of its proper divisors (3086431).

91173889 is a wasteful number, since it uses less digits than its factorization.

91173889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21999.

The product of its digits is 108864, while the sum is 46.

The square root of 91173889 is about 9548.5019243858. The cubic root of 91173889 is about 450.0804613326.

The spelling of 91173889 in words is "ninety-one million, one hundred seventy-three thousand, eight hundred eighty-nine".