998203891 has 2 divisors, whose sum is σ = 998203892. Its totient is φ = 998203890.

The previous prime is 998203889. The next prime is 998203957. The reversal of 998203891 is 198302899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998203891 - 2¹ = 998203889 is a prime.

It is a super-2 number, since 2×998203891² = 1992822016015079762, which contains 22 as substring.

Together with 998203889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (998203291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499101945 + 499101946.

It is an arithmetic number, because the mean of its divisors is an integer number (499101946).

Almost surely, 2^998203891 is an apocalyptic number.

998203891 is a deficient number, since it is larger than the sum of its proper divisors (1).

998203891 is an equidigital number, since it uses as much as digits as its factorization.

998203891 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 49.

The square root of 998203891 is about 31594.3648614749. The cubic root of 998203891 is about 999.4009381966.

The spelling of 998203891 in words is "nine hundred ninety-eight million, two hundred three thousand, eight hundred ninety-one".