9981551899 has 4 divisors (see below), whose sum is σ = 10888965720. Its totient is φ = 9074138080.

The previous prime is 9981551893. The next prime is 9981551917.

9981551899 is nontrivially palindromic in base 10.

9981551899 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9981551899 - 2¹³ = 9981543707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9981551899.

It is not an unprimeable number, because it can be changed into a prime (9981551893) 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 3 ways as a sum of consecutive naturals, for example, 453706894 + ... + 453706915.

It is an arithmetic number, because the mean of its divisors is an integer number (2722241430).

Almost surely, 2^9981551899 is an apocalyptic number.

9981551899 is a deficient number, since it is larger than the sum of its proper divisors (907413821).

9981551899 is a wasteful number, since it uses less digits than its factorization.

9981551899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907413820.

The product of its digits is 10497600, while the sum is 64.

The square root of 9981551899 is about 99907.7169141603. The cubic root of 9981551899 is about 2153.1090335439.

The spelling of 9981551899 in words is "nine billion, nine hundred eighty-one million, five hundred fifty-one thousand, eight hundred ninety-nine".