81743831512 has 16 divisors (see below), whose sum is σ = 175165353360. Its totient is φ = 35033070624.

The previous prime is 81743831483. The next prime is 81743831551. The reversal of 81743831512 is 21513834718.

It is a super-2 number, since 2×81743831512² (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, 729855583 + ... + 729855694.

It is an arithmetic number, because the mean of its divisors is an integer number (10947834585).

Almost surely, 2^81743831512 is an apocalyptic number.

It is an amenable number.

81743831512 is an abundant number, since it is smaller than the sum of its proper divisors (93421521848).

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

81743831512 is a wasteful number, since it uses less digits than its factorization.

81743831512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459711290 (or 1459711286 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The spelling of 81743831512 in words is "eighty-one billion, seven hundred forty-three million, eight hundred thirty-one thousand, five hundred twelve".