9981208835 has 32 divisors (see below), whose sum is σ = 13595480640. Its totient is φ = 6982230528.

The previous prime is 9981208819. The next prime is 9981208873. The reversal of 9981208835 is 5388021899.

It is a Cunningham number, because it is equal to 99906²-1.

It is not a de Polignac number, because 9981208835 - 2⁴ = 9981208819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49952 + ... + 149858.

It is an arithmetic number, because the mean of its divisors is an integer number (424858770).

Almost surely, 2^9981208835 is an apocalyptic number.

9981208835 is a deficient number, since it is larger than the sum of its proper divisors (3614271805).

9981208835 is a wasteful number, since it uses less digits than its factorization.

9981208835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100007.

The product of its (nonzero) digits is 1244160, while the sum is 53.

The square root of 9981208835 is about 99905.9999949953. Note that the first 5 decimals coincide. The cubic root of 9981208835 is about 2153.0843659482.

The spelling of 9981208835 in words is "nine billion, nine hundred eighty-one million, two hundred eight thousand, eight hundred thirty-five".