998642719 has 2 divisors, whose sum is σ = 998642720. Its totient is φ = 998642718.

The previous prime is 998642693. The next prime is 998642767. The reversal of 998642719 is 917246899.

998642719 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 is a cyclic number.

It is not a de Polignac number, because 998642719 - 2¹⁵ = 998609951 is a prime.

It is a super-2 number, since 2×998642719² = 1994574560423425922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 998642719.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998642789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499321359 + 499321360.

It is an arithmetic number, because the mean of its divisors is an integer number (499321360).

Almost surely, 2^998642719 is an apocalyptic number.

998642719 is a deficient number, since it is larger than the sum of its proper divisors (1).

998642719 is an equidigital number, since it uses as much as digits as its factorization.

998642719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 55.

The square root of 998642719 is about 31601.3088178322. The cubic root of 998642719 is about 999.5473681553.

The spelling of 998642719 in words is "nine hundred ninety-eight million, six hundred forty-two thousand, seven hundred nineteen".