998044391 has 2 divisors, whose sum is σ = 998044392. Its totient is φ = 998044390.

The previous prime is 998044387. The next prime is 998044403. The reversal of 998044391 is 193440899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998044391 - 2² = 998044387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998044351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499022195 + 499022196.

It is an arithmetic number, because the mean of its divisors is an integer number (499022196).

Almost surely, 2^998044391 is an apocalyptic number.

998044391 is a deficient number, since it is larger than the sum of its proper divisors (1).

998044391 is an equidigital number, since it uses as much as digits as its factorization.

998044391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 998044391 is about 31591.8405763260. The cubic root of 998044391 is about 999.3477049370.

The spelling of 998044391 in words is "nine hundred ninety-eight million, forty-four thousand, three hundred ninety-one".