9281138421556 has 12 divisors (see below), whose sum is σ = 16256378421220. Its totient is φ = 4636458872640.

The previous prime is 9281138421523. The next prime is 9281138421571. The reversal of 9281138421556 is 6551248311829.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4080868653456 + 5200269768100 = 2020116^2 + 2280410^2 .

It is a super-2 number, since 2×9281138421556² (a number of 27 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 9281138421497 and 9281138421506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1027579455 + ... + 1027588486.

Almost surely, 2^{9281138421556} is an apocalyptic number.

It is an amenable number.

9281138421556 is a deficient number, since it is larger than the sum of its proper divisors (6975239999664).

9281138421556 is a wasteful number, since it uses less digits than its factorization.

9281138421556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2055169074 (or 2055169072 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 55.

The spelling of 9281138421556 in words is "nine trillion, two hundred eighty-one billion, one hundred thirty-eight million, four hundred twenty-one thousand, five hundred fifty-six".