998939969 has 2 divisors, whose sum is σ = 998939970. Its totient is φ = 998939968.

The previous prime is 998939899. The next prime is 998939971. The reversal of 998939969 is 969939899.

998939969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 943288369 + 55651600 = 30713^2 + 7460^2 .

It is a cyclic number.

It is not a de Polignac number, because 998939969 - 2²⁰ = 997891393 is a prime.

It is a super-2 number, since 2×998939969² = 1995762123331441922, which contains 22 as substring.

Together with 998939971, 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 (998939989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499469984 + 499469985.

It is an arithmetic number, because the mean of its divisors is an integer number (499469985).

Almost surely, 2^998939969 is an apocalyptic number.

It is an amenable number.

998939969 is a deficient number, since it is larger than the sum of its proper divisors (1).

998939969 is an equidigital number, since it uses as much as digits as its factorization.

998939969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76527504, while the sum is 71.

The square root of 998939969 is about 31606.0115958974. The cubic root of 998939969 is about 999.6465314080.

The spelling of 998939969 in words is "nine hundred ninety-eight million, nine hundred thirty-nine thousand, nine hundred sixty-nine".