85997 has 4 divisors (see below), whose sum is σ = 89760. Its totient is φ = 82236.

The previous prime is 85991. The next prime is 85999. The reversal of 85997 is 79958.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79958 = 2 ⋅39979.

It is a cyclic number.

It is not a de Polignac number, because 85997 - 2⁶ = 85933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85991) 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, 1847 + ... + 1892.

It is an arithmetic number, because the mean of its divisors is an integer number (22440).

2⁸⁵⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

85997 is a deficient number, since it is larger than the sum of its proper divisors (3763).

85997 is a wasteful number, since it uses less digits than its factorization.

85997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3762.

The product of its digits is 22680, while the sum is 38.

The square root of 85997 is about 293.2524509701. The cubic root of 85997 is about 44.1395363621.

The spelling of 85997 in words is "eighty-five thousand, nine hundred ninety-seven".