85823891 has 2 divisors, whose sum is σ = 85823892. Its totient is φ = 85823890.

The previous prime is 85823887. The next prime is 85823897. The reversal of 85823891 is 19832858.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85823891 - 2² = 85823887 is a prime.

It is not a weakly prime, because it can be changed into another prime (85823897) 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 as a sum of consecutive naturals, namely, 42911945 + 42911946.

It is an arithmetic number, because the mean of its divisors is an integer number (42911946).

Almost surely, 2^85823891 is an apocalyptic number.

85823891 is a deficient number, since it is larger than the sum of its proper divisors (1).

85823891 is an equidigital number, since it uses as much as digits as its factorization.

85823891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 44.

The square root of 85823891 is about 9264.1184685862. The cubic root of 85823891 is about 441.0989934476.

The spelling of 85823891 in words is "eighty-five million, eight hundred twenty-three thousand, eight hundred ninety-one".