85091 has 2 divisors, whose sum is σ = 85092. Its totient is φ = 85090.

The previous prime is 85087. The next prime is 85093. The reversal of 85091 is 19058.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85091 - 2² = 85087 is a prime.

Together with 85093, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 85091.

It is not a weakly prime, because it can be changed into another prime (85093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42545 + 42546.

It is an arithmetic number, because the mean of its divisors is an integer number (42546).

2⁸⁵⁰⁹¹ is an apocalyptic number.

85091 is a deficient number, since it is larger than the sum of its proper divisors (1).

85091 is an equidigital number, since it uses as much as digits as its factorization.

85091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 85091 is about 291.7036167071. The cubic root of 85091 is about 43.9839817726.

The spelling of 85091 in words is "eighty-five thousand, ninety-one".