9883747981 has 4 divisors (see below), whose sum is σ = 9884862364. Its totient is φ = 9882633600.

The previous prime is 9883747967. The next prime is 9883747999. The reversal of 9883747981 is 1897473889.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1897473889 = 73 ⋅25992793.

It can be written as a sum of positive squares in 2 ways, for example, as 5032625481 + 4851122500 = 70941^2 + 69650^2 .

It is a cyclic number.

It is not a de Polignac number, because 9883747981 - 2⁹ = 9883747469 is a prime.

It is a super-2 number, since 2×9883747981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9883747901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 543780 + ... + 561661.

It is an arithmetic number, because the mean of its divisors is an integer number (2471215591).

Almost surely, 2^9883747981 is an apocalyptic number.

It is an amenable number.

9883747981 is a deficient number, since it is larger than the sum of its proper divisors (1114383).

9883747981 is a wasteful number, since it uses less digits than its factorization.

9883747981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114382.

The product of its digits is 24385536, while the sum is 64.

The square root of 9883747981 is about 99417.0406972567. The cubic root of 9883747981 is about 2146.0535487351.

The spelling of 9883747981 in words is "nine billion, eight hundred eighty-three million, seven hundred forty-seven thousand, nine hundred eighty-one".