9987799199 has 8 divisors (see below), whose sum is σ = 11415700128. Its totient is φ = 8560166400.

The previous prime is 9987799187. The next prime is 9987799229. The reversal of 9987799199 is 9919977899.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9987799199 is a prime.

It is a super-2 number, since 2×9987799199² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987799109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20399 + ... + 142799.

It is an arithmetic number, because the mean of its divisors is an integer number (1426962516).

Almost surely, 2^9987799199 is an apocalyptic number.

9987799199 is a deficient number, since it is larger than the sum of its proper divisors (1427900929).

9987799199 is a wasteful number, since it uses less digits than its factorization.

9987799199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134065.

The product of its digits is 208324872, while the sum is 77.

The square root of 9987799199 is about 99938.9773761969. The cubic root of 9987799199 is about 2153.5581391504.

The spelling of 9987799199 in words is "nine billion, nine hundred eighty-seven million, seven hundred ninety-nine thousand, one hundred ninety-nine".