85105891 has 4 divisors (see below), whose sum is σ = 91652512. Its totient is φ = 78559272.

The previous prime is 85105877. The next prime is 85105903. The reversal of 85105891 is 19850158.

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-85105891 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 85105891.

It is not an unprimeable number, because it can be changed into a prime (85105841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3273291 + ... + 3273316.

It is an arithmetic number, because the mean of its divisors is an integer number (22913128).

Almost surely, 2^85105891 is an apocalyptic number.

85105891 is a deficient number, since it is larger than the sum of its proper divisors (6546621).

85105891 is a wasteful number, since it uses less digits than its factorization.

85105891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6546620.

The product of its (nonzero) digits is 14400, while the sum is 37.

The square root of 85105891 is about 9225.2854156389. The cubic root of 85105891 is about 439.8654736811.

The spelling of 85105891 in words is "eighty-five million, one hundred five thousand, eight hundred ninety-one".