998180459 has 2 divisors, whose sum is σ = 998180460. Its totient is φ = 998180458.

The previous prime is 998180441. The next prime is 998180497. The reversal of 998180459 is 954081899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998180459 - 2¹² = 998176363 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 998180459.

It is not a weakly prime, because it can be changed into another prime (998180419) 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, 499090229 + 499090230.

It is an arithmetic number, because the mean of its divisors is an integer number (499090230).

Almost surely, 2^998180459 is an apocalyptic number.

998180459 is a deficient number, since it is larger than the sum of its proper divisors (1).

998180459 is an equidigital number, since it uses as much as digits as its factorization.

998180459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 53.

The square root of 998180459 is about 31593.9940336767. The cubic root of 998180459 is about 999.3931181022.

The spelling of 998180459 in words is "nine hundred ninety-eight million, one hundred eighty thousand, four hundred fifty-nine".