85163831 has 4 divisors (see below), whose sum is σ = 85335000. Its totient is φ = 84992664.

The previous prime is 85163809. The next prime is 85163867. The reversal of 85163831 is 13836158.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85163831 is a prime.

It is a super-3 number, since 3×85163831³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85163791 and 85163800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85163801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84836 + ... + 85833.

It is an arithmetic number, because the mean of its divisors is an integer number (21333750).

Almost surely, 2^85163831 is an apocalyptic number.

85163831 is a deficient number, since it is larger than the sum of its proper divisors (171169).

85163831 is a wasteful number, since it uses less digits than its factorization.

85163831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171168.

The product of its digits is 17280, while the sum is 35.

The square root of 85163831 is about 9228.4251635910. The cubic root of 85163831 is about 439.9652710193.

Adding to 85163831 its reverse (13836158), we get a palindrome (98999989).

The spelling of 85163831 in words is "eighty-five million, one hundred sixty-three thousand, eight hundred thirty-one".