85191865 has 12 divisors (see below), whose sum is σ = 112369572. Its totient is φ = 61957280.

The previous prime is 85191863. The next prime is 85191889. The reversal of 85191865 is 56819158.

It can be written as a sum of positive squares in 2 ways, for example, as 31843449 + 53348416 = 5643^2 + 7304^2 .

It is not a de Polignac number, because 85191865 - 2¹ = 85191863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85191863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69802 + ... + 71011.

It is an arithmetic number, because the mean of its divisors is an integer number (9364131).

Almost surely, 2^85191865 is an apocalyptic number.

It is an amenable number.

85191865 is a deficient number, since it is larger than the sum of its proper divisors (27177707).

85191865 is a wasteful number, since it uses less digits than its factorization.

85191865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140840 (or 140829 counting only the distinct ones).

The product of its digits is 86400, while the sum is 43.

The square root of 85191865 is about 9229.9439326574. The cubic root of 85191865 is about 440.0135412499.

The spelling of 85191865 in words is "eighty-five million, one hundred ninety-one thousand, eight hundred sixty-five".