85811797 has 4 divisors (see below), whose sum is σ = 85970956. Its totient is φ = 85652640.

The previous prime is 85811777. The next prime is 85811849. The reversal of 85811797 is 79711858.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46799281 + 39012516 = 6841^2 + 6246^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85811797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85811777) 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 3 ways as a sum of consecutive naturals, for example, 78768 + ... + 79849.

It is an arithmetic number, because the mean of its divisors is an integer number (21492739).

Almost surely, 2^85811797 is an apocalyptic number.

It is an amenable number.

85811797 is a deficient number, since it is larger than the sum of its proper divisors (159159).

85811797 is a wasteful number, since it uses less digits than its factorization.

85811797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159158.

The product of its digits is 141120, while the sum is 46.

The square root of 85811797 is about 9263.4657121404. The cubic root of 85811797 is about 441.0782731028.

The spelling of 85811797 in words is "eighty-five million, eight hundred eleven thousand, seven hundred ninety-seven".