81131014486992 has 40 divisors (see below), whose sum is σ = 209598691941216. Its totient is φ = 27042350482816.

The previous prime is 81131014486961. The next prime is 81131014486993. The reversal of 81131014486992 is 29968441013118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81131014486993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40288518 + ... + 42254309.

Almost surely, 2^{81131014486992} is an apocalyptic number.

It is an amenable number.

81131014486992 is an abundant number, since it is smaller than the sum of its proper divisors (128467677454224).

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

81131014486992 is a wasteful number, since it uses less digits than its factorization.

81131014486992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82563315 (or 82563309 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 57.

The spelling of 81131014486992 in words is "eighty-one trillion, one hundred thirty-one billion, fourteen million, four hundred eighty-six thousand, nine hundred ninety-two".