998128847 has 2 divisors, whose sum is σ = 998128848. Its totient is φ = 998128846.

The previous prime is 998128823. The next prime is 998128889. The reversal of 998128847 is 748821899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998128847 - 2¹⁴ = 998112463 is a prime.

It is a super-2 number, since 2×998128847² = 1992522390427098818, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 998128792 and 998128801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998122847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499064423 + 499064424.

It is an arithmetic number, because the mean of its divisors is an integer number (499064424).

Almost surely, 2^998128847 is an apocalyptic number.

998128847 is a deficient number, since it is larger than the sum of its proper divisors (1).

998128847 is an equidigital number, since it uses as much as digits as its factorization.

998128847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2322432, while the sum is 56.

The square root of 998128847 is about 31593.1772223055. The cubic root of 998128847 is about 999.3758929047.

The spelling of 998128847 in words is "nine hundred ninety-eight million, one hundred twenty-eight thousand, eight hundred forty-seven".