998945491 has 2 divisors, whose sum is σ = 998945492. Its totient is φ = 998945490.

The previous prime is 998945489. The next prime is 998945531. The reversal of 998945491 is 194549899.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998945491 - 2¹ = 998945489 is a prime.

Together with 998945489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (998945401) 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, 499472745 + 499472746.

It is an arithmetic number, because the mean of its divisors is an integer number (499472746).

Almost surely, 2^998945491 is an apocalyptic number.

998945491 is a deficient number, since it is larger than the sum of its proper divisors (1).

998945491 is an equidigital number, since it uses as much as digits as its factorization.

998945491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4199040, while the sum is 58.

The square root of 998945491 is about 31606.0989525756. The cubic root of 998945491 is about 999.6483733732.

The spelling of 998945491 in words is "nine hundred ninety-eight million, nine hundred forty-five thousand, four hundred ninety-one".