81039103936 has 84 divisors (see below), whose sum is σ = 188101824456. Its totient is φ = 34538918400.

The previous prime is 81039103919. The next prime is 81039103949. The reversal of 81039103936 is 63930193018.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81039103892 and 81039103901.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 496231 + ... + 639001.

It is an arithmetic number, because the mean of its divisors is an integer number (2239307434).

Almost surely, 2^81039103936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81039103936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94050912228).

81039103936 is an abundant number, since it is smaller than the sum of its proper divisors (107062720520).

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

81039103936 is a wasteful number, since it uses less digits than its factorization.

81039103936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142978 (or 142961 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 43.

The spelling of 81039103936 in words is "eighty-one billion, thirty-nine million, one hundred three thousand, nine hundred thirty-six".