81237241036 has 24 divisors (see below), whose sum is σ = 162879677856. Its totient is φ = 34729132800.

The previous prime is 81237240977. The next prime is 81237241051. The reversal of 81237241036 is 63014273218.

It is a happy number.

It is a super-2 number, since 2×81237241036² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81237240986 and 81237241004.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3606391 + ... + 3628846.

It is an arithmetic number, because the mean of its divisors is an integer number (6786653244).

Almost surely, 2^81237241036 is an apocalyptic number.

It is an amenable number.

81237241036 is an abundant number, since it is smaller than the sum of its proper divisors (81642436820).

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

81237241036 is a wasteful number, since it uses less digits than its factorization.

81237241036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7235649 (or 7235647 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 81237241036 in words is "eighty-one billion, two hundred thirty-seven million, two hundred forty-one thousand, thirty-six".