91889 has 4 divisors (see below), whose sum is σ = 105024. Its totient is φ = 78756.

The previous prime is 91873. The next prime is 91909. The reversal of 91889 is 98819.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91889 - 2⁴ = 91873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (93889) 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, 6557 + ... + 6570.

It is an arithmetic number, because the mean of its divisors is an integer number (26256).

2⁹¹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

91889 is a deficient number, since it is larger than the sum of its proper divisors (13135).

91889 is a wasteful number, since it uses less digits than its factorization.

91889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13134.

The product of its digits is 5184, while the sum is 35.

The square root of 91889 is about 303.1319844556. The cubic root of 91889 is about 45.1254114802.

The spelling of 91889 in words is "ninety-one thousand, eight hundred eighty-nine".