9899981937 has 24 divisors (see below), whose sum is σ = 14369803656. Its totient is φ = 6567837696.

The previous prime is 9899981929. The next prime is 9899981957. The reversal of 9899981937 is 7391899989.

9899981937 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1444076001 + 8455905936 = 38001^2 + 91956^2 .

It is not a de Polignac number, because 9899981937 - 2³ = 9899981929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9899981957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1747213 + ... + 1752869.

It is an arithmetic number, because the mean of its divisors is an integer number (598741819).

Almost surely, 2^9899981937 is an apocalyptic number.

It is an amenable number.

9899981937 is a deficient number, since it is larger than the sum of its proper divisors (4469821719).

9899981937 is a wasteful number, since it uses less digits than its factorization.

9899981937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6577 (or 6574 counting only the distinct ones).

The product of its digits is 79361856, while the sum is 72.

The square root of 9899981937 is about 99498.6529406303. The cubic root of 9899981937 is about 2147.2278631124.

The spelling of 9899981937 in words is "nine billion, eight hundred ninety-nine million, nine hundred eighty-one thousand, nine hundred thirty-seven".