998393191 has 2 divisors, whose sum is σ = 998393192. Its totient is φ = 998393190.

The previous prime is 998393159. The next prime is 998393243. The reversal of 998393191 is 191393899.

998393191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (998393243) can be obtained adding 998393191 to its sum of digits (52).

It is a weak prime.

It is an emirp because it is prime and its reverse (191393899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998393191 - 2⁵ = 998393159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998393491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499196595 + 499196596.

It is an arithmetic number, because the mean of its divisors is an integer number (499196596).

Almost surely, 2^998393191 is an apocalyptic number.

998393191 is a deficient number, since it is larger than the sum of its proper divisors (1).

998393191 is an equidigital number, since it uses as much as digits as its factorization.

998393191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 472392, while the sum is 52.

The square root of 998393191 is about 31597.3605068525. The cubic root of 998393191 is about 999.4641098731.

The spelling of 998393191 in words is "nine hundred ninety-eight million, three hundred ninety-three thousand, one hundred ninety-one".