85999091 has 2 divisors, whose sum is σ = 85999092. Its totient is φ = 85999090.

The previous prime is 85999051. The next prime is 85999171. The reversal of 85999091 is 19099958.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85999091 - 2⁶ = 85999027 is a prime.

It is not a weakly prime, because it can be changed into another prime (85999021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42999545 + 42999546.

It is an arithmetic number, because the mean of its divisors is an integer number (42999546).

Almost surely, 2^85999091 is an apocalyptic number.

85999091 is a deficient number, since it is larger than the sum of its proper divisors (1).

85999091 is an equidigital number, since it uses as much as digits as its factorization.

85999091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 50.

The square root of 85999091 is about 9273.5694853708. The cubic root of 85999091 is about 441.3989410719.

The spelling of 85999091 in words is "eighty-five million, nine hundred ninety-nine thousand, ninety-one".