998911423 has 2 divisors, whose sum is σ = 998911424. Its totient is φ = 998911422.

The previous prime is 998911421. The next prime is 998911429. The reversal of 998911423 is 324119899.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998911423 - 2¹ = 998911421 is a prime.

Together with 998911421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998911421) 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, 499455711 + 499455712.

It is an arithmetic number, because the mean of its divisors is an integer number (499455712).

Almost surely, 2^998911423 is an apocalyptic number.

998911423 is a deficient number, since it is larger than the sum of its proper divisors (1).

998911423 is an equidigital number, since it uses as much as digits as its factorization.

998911423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 46.

The square root of 998911423 is about 31605.5600013668. The cubic root of 998911423 is about 999.6370092537.

It can be divided in two parts, 9989 and 11423, that added together give a palindrome (21412).

The spelling of 998911423 in words is "nine hundred ninety-eight million, nine hundred eleven thousand, four hundred twenty-three".