85081731312 has 20 divisors (see below), whose sum is σ = 219794472680. Its totient is φ = 28360577088.

The previous prime is 85081731281. The next prime is 85081731331. The reversal of 85081731312 is 21313718058.

It is a super-2 number, since 2×85081731312² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 886267987 + ... + 886268082.

It is an arithmetic number, because the mean of its divisors is an integer number (10989723634).

Almost surely, 2^85081731312 is an apocalyptic number.

It is an amenable number.

85081731312 is an abundant number, since it is smaller than the sum of its proper divisors (134712741368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85081731312 is a wasteful number, since it uses less digits than its factorization.

85081731312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772536080 (or 1772536074 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 85081731312 in words is "eighty-five billion, eighty-one million, seven hundred thirty-one thousand, three hundred twelve".