85811817 has 16 divisors (see below), whose sum is σ = 140819840. Its totient is φ = 45263232.

The previous prime is 85811777. The next prime is 85811849. The reversal of 85811817 is 71811858.

It is not a de Polignac number, because 85811817 - 2¹⁹ = 85287529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (85811867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156892 + ... + 157437.

It is an arithmetic number, because the mean of its divisors is an integer number (8801240).

Almost surely, 2^85811817 is an apocalyptic number.

It is an amenable number.

85811817 is a deficient number, since it is larger than the sum of its proper divisors (55008023).

85811817 is a wasteful number, since it uses less digits than its factorization.

85811817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314352.

The product of its digits is 17920, while the sum is 39.

The square root of 85811817 is about 9263.4667916499. The cubic root of 85811817 is about 441.0783073699.

The spelling of 85811817 in words is "eighty-five million, eight hundred eleven thousand, eight hundred seventeen".