85899857 has 2 divisors, whose sum is σ = 85899858. Its totient is φ = 85899856.

The previous prime is 85899799. The next prime is 85899887. The reversal of 85899857 is 75899858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80442961 + 5456896 = 8969^2 + 2336^2 .

It is a cyclic number.

It is not a de Polignac number, because 85899857 - 2⁸ = 85899601 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 85899796 and 85899805.

It is not a weakly prime, because it can be changed into another prime (85899887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42949928 + 42949929.

It is an arithmetic number, because the mean of its divisors is an integer number (42949929).

Almost surely, 2^85899857 is an apocalyptic number.

It is an amenable number.

85899857 is a deficient number, since it is larger than the sum of its proper divisors (1).

85899857 is an equidigital number, since it uses as much as digits as its factorization.

85899857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7257600, while the sum is 59.

The square root of 85899857 is about 9268.2175740538. The cubic root of 85899857 is about 441.2290995833.

Subtracting from 85899857 its reverse (75899858), we obtain a palindrome (9999999).

The spelling of 85899857 in words is "eighty-five million, eight hundred ninety-nine thousand, eight hundred fifty-seven".