85999799 has 2 divisors, whose sum is σ = 85999800. Its totient is φ = 85999798.

The previous prime is 85999777. The next prime is 85999811. The reversal of 85999799 is 99799958.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85999799 - 2²⁴ = 69222583 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85999399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42999899 + 42999900.

It is an arithmetic number, because the mean of its divisors is an integer number (42999900).

Almost surely, 2^85999799 is an apocalyptic number.

85999799 is a deficient number, since it is larger than the sum of its proper divisors (1).

85999799 is an equidigital number, since it uses as much as digits as its factorization.

85999799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16533720, while the sum is 65.

The square root of 85999799 is about 9273.6076582957. The cubic root of 85999799 is about 441.4001523622.

The spelling of 85999799 in words is "eighty-five million, nine hundred ninety-nine thousand, seven hundred ninety-nine".