85919 has 4 divisors (see below), whose sum is σ = 86640. Its totient is φ = 85200.

The previous prime is 85909. The next prime is 85931. The reversal of 85919 is 91958.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 91958 = 2 ⋅45979.

It is a cyclic number.

It is not a de Polignac number, because 85919 - 2⁴ = 85903 is a prime.

It is a super-2 number, since 2×85919² = 14764149122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85909) 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, 134 + ... + 435.

It is an arithmetic number, because the mean of its divisors is an integer number (21660).

2⁸⁵⁹¹⁹ is an apocalyptic number.

85919 is a deficient number, since it is larger than the sum of its proper divisors (721).

85919 is a wasteful number, since it uses less digits than its factorization.

85919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720.

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

The square root of 85919 is about 293.1194295846. The cubic root of 85919 is about 44.1261873488.

It can be divided in two parts, 859 and 19, that added together give a palindrome (878).

The spelling of 85919 in words is "eighty-five thousand, nine hundred nineteen".