85775891 has 4 divisors (see below), whose sum is σ = 85797432. Its totient is φ = 85754352.

The previous prime is 85775867. The next prime is 85775923. The reversal of 85775891 is 19857758.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19857758 = 2 ⋅9928879.

It is a cyclic number.

It is not a de Polignac number, because 85775891 - 2⁶ = 85775827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85775831) 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, 2861 + ... + 13406.

It is an arithmetic number, because the mean of its divisors is an integer number (21449358).

Almost surely, 2^85775891 is an apocalyptic number.

85775891 is a deficient number, since it is larger than the sum of its proper divisors (21541).

85775891 is a wasteful number, since it uses less digits than its factorization.

85775891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21540.

The product of its digits is 705600, while the sum is 50.

The square root of 85775891 is about 9261.5274658125. The cubic root of 85775891 is about 441.0167447875.

The spelling of 85775891 in words is "eighty-five million, seven hundred seventy-five thousand, eight hundred ninety-one".