998999799929 has 2 divisors, whose sum is σ = 998999799930. Its totient is φ = 998999799928.

The previous prime is 998999799913. The next prime is 998999800009. The reversal of 998999799929 is 929997999899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 919911174400 + 79088625529 = 959120^2 + 281227^2 .

It is a cyclic number.

It is not a de Polignac number, because 998999799929 - 2⁴ = 998999799913 is a prime.

It is not a weakly prime, because it can be changed into another prime (998999999929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499499899964 + 499499899965.

It is an arithmetic number, because the mean of its divisors is an integer number (499499899965).

Almost surely, 2^998999799929 is an apocalyptic number.

It is an amenable number.

998999799929 is a deficient number, since it is larger than the sum of its proper divisors (1).

998999799929 is an equidigital number, since it uses as much as digits as its factorization.

998999799929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43391094768, while the sum is 98.

The spelling of 998999799929 in words is "nine hundred ninety-eight billion, nine hundred ninety-nine million, seven hundred ninety-nine thousand, nine hundred twenty-nine".