91859 has 4 divisors (see below), whose sum is σ = 92904. Its totient is φ = 90816.

The previous prime is 91841. The next prime is 91867. The reversal of 91859 is 95819.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91159) 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, 377 + ... + 570.

It is an arithmetic number, because the mean of its divisors is an integer number (23226).

2⁹¹⁸⁵⁹ is an apocalyptic number.

91859 is a deficient number, since it is larger than the sum of its proper divisors (1045).

91859 is an equidigital number, since it uses as much as digits as its factorization.

91859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044.

The product of its digits is 3240, while the sum is 32.

The square root of 91859 is about 303.0824970202. The cubic root of 91859 is about 45.1205000846.

The spelling of 91859 in words is "ninety-one thousand, eight hundred fifty-nine".