85999777 has 2 divisors, whose sum is σ = 85999778. Its totient is φ = 85999776.

The previous prime is 85999751. The next prime is 85999799. The reversal of 85999777 is 77799958.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81739681 + 4260096 = 9041^2 + 2064^2 .

It is a cyclic number.

It is not a de Polignac number, because 85999777 - 2⁷ = 85999649 is a prime.

It is not a weakly prime, because it can be changed into another prime (85993777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42999888 + 42999889.

It is an arithmetic number, because the mean of its divisors is an integer number (42999889).

Almost surely, 2^85999777 is an apocalyptic number.

It is an amenable number.

85999777 is a deficient number, since it is larger than the sum of its proper divisors (1).

85999777 is an equidigital number, since it uses as much as digits as its factorization.

85999777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10001880, while the sum is 61.

The square root of 85999777 is about 9273.6064721337. The cubic root of 85999777 is about 441.4001147233.

The spelling of 85999777 in words is "eighty-five million, nine hundred ninety-nine thousand, seven hundred seventy-seven".