85999811 has 2 divisors, whose sum is σ = 85999812. Its totient is φ = 85999810.

The previous prime is 85999799. The next prime is 85999841. The reversal of 85999811 is 11899958.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85999811 - 2²⁶ = 18890947 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85999811.

It is not a weakly prime, because it can be changed into another prime (85999841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42999905 + 42999906.

It is an arithmetic number, because the mean of its divisors is an integer number (42999906).

Almost surely, 2^85999811 is an apocalyptic number.

85999811 is a deficient number, since it is larger than the sum of its proper divisors (1).

85999811 is an equidigital number, since it uses as much as digits as its factorization.

85999811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 50.

The square root of 85999811 is about 9273.6083052930. The cubic root of 85999811 is about 441.4001728924.

The spelling of 85999811 in words is "eighty-five million, nine hundred ninety-nine thousand, eight hundred eleven".