85181031 has 16 divisors (see below), whose sum is σ = 135901920. Its totient is φ = 52418880.

The previous prime is 85181021. The next prime is 85181051. The reversal of 85181031 is 13018158.

It is not a de Polignac number, because 85181031 - 2¹⁸ = 84918887 is a prime.

It is a super-2 number, since 2×85181031² = 14511616084445922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 85180986 and 85181004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85181011) 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, 120990 + ... + 121691.

It is an arithmetic number, because the mean of its divisors is an integer number (8493870).

Almost surely, 2^85181031 is an apocalyptic number.

85181031 is a deficient number, since it is larger than the sum of its proper divisors (50720889).

85181031 is a wasteful number, since it uses less digits than its factorization.

85181031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242703 (or 242697 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 85181031 is about 9229.3570198579. The cubic root of 85181031 is about 439.9948880260.

Adding to 85181031 its reverse (13018158), we get a palindrome (98199189).

The spelling of 85181031 in words is "eighty-five million, one hundred eighty-one thousand, thirty-one".