85190891 has 4 divisors (see below), whose sum is σ = 85210152. Its totient is φ = 85171632.

The previous prime is 85190881. The next prime is 85190921. The reversal of 85190891 is 19809158.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19809158 = 2 ⋅9904579.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85190891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85190881) 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, 695 + ... + 13071.

It is an arithmetic number, because the mean of its divisors is an integer number (21302538).

Almost surely, 2^85190891 is an apocalyptic number.

85190891 is a deficient number, since it is larger than the sum of its proper divisors (19261).

85190891 is a wasteful number, since it uses less digits than its factorization.

85190891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19260.

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 85190891 is about 9229.8911694559. The cubic root of 85190891 is about 440.0118643495.

The spelling of 85190891 in words is "eighty-five million, one hundred ninety thousand, eight hundred ninety-one".