9899981929 has 2 divisors, whose sum is σ = 9899981930. Its totient is φ = 9899981928.

The previous prime is 9899981921. The next prime is 9899981957. The reversal of 9899981929 is 9291899989.

9899981929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5768706304 + 4131275625 = 75952^2 + 64275^2 .

It is an emirp because it is prime and its reverse (9291899989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9899981929 - 2³ = 9899981921 is a prime.

It is a super-2 number, since 2×9899981929² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9899981921) 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 as a sum of consecutive naturals, namely, 4949990964 + 4949990965.

It is an arithmetic number, because the mean of its divisors is an integer number (4949990965).

Almost surely, 2^9899981929 is an apocalyptic number.

It is an amenable number.

9899981929 is a deficient number, since it is larger than the sum of its proper divisors (1).

9899981929 is an equidigital number, since it uses as much as digits as its factorization.

9899981929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68024448, while the sum is 73.

The square root of 9899981929 is about 99498.6529004288. The cubic root of 9899981929 is about 2147.2278625340.

The spelling of 9899981929 in words is "nine billion, eight hundred ninety-nine million, nine hundred eighty-one thousand, nine hundred twenty-nine".