998979899 has 2 divisors, whose sum is σ = 998979900. Its totient is φ = 998979898.

The previous prime is 998979833. The next prime is 998979901.

998979899 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 998979899 - 2¹⁶ = 998914363 is a prime.

Together with 998979901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (998979809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499489949 + 499489950.

It is an arithmetic number, because the mean of its divisors is an integer number (499489950).

Almost surely, 2^998979899 is an apocalyptic number.

998979899 is a deficient number, since it is larger than the sum of its proper divisors (1).

998979899 is an equidigital number, since it uses as much as digits as its factorization.

998979899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238085568, while the sum is 77.

The square root of 998979899 is about 31606.6432732108. The cubic root of 998979899 is about 999.6598506449.

The spelling of 998979899 in words is "nine hundred ninety-eight million, nine hundred seventy-nine thousand, eight hundred ninety-nine".