998642647 has 2 divisors, whose sum is σ = 998642648. Its totient is φ = 998642646.

The previous prime is 998642629. The next prime is 998642683. The reversal of 998642647 is 746246899.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998642647 - 2²⁷ = 864424919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998640647) 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, 499321323 + 499321324.

It is an arithmetic number, because the mean of its divisors is an integer number (499321324).

Almost surely, 2^998642647 is an apocalyptic number.

998642647 is a deficient number, since it is larger than the sum of its proper divisors (1).

998642647 is an equidigital number, since it uses as much as digits as its factorization.

998642647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 55.

The square root of 998642647 is about 31601.3076786389. The cubic root of 998642647 is about 999.5473441336.

The spelling of 998642647 in words is "nine hundred ninety-eight million, six hundred forty-two thousand, six hundred forty-seven".