998812799 has 2 divisors, whose sum is σ = 998812800. Its totient is φ = 998812798.

The previous prime is 998812753. The next prime is 998812811. The reversal of 998812799 is 997218899.

It is a strong prime.

It is an emirp because it is prime and its reverse (997218899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998812799 - 2²⁰ = 997764223 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998812739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499406399 + 499406400.

It is an arithmetic number, because the mean of its divisors is an integer number (499406400).

Almost surely, 2^998812799 is an apocalyptic number.

998812799 is a deficient number, since it is larger than the sum of its proper divisors (1).

998812799 is an equidigital number, since it uses as much as digits as its factorization.

998812799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 62.

The square root of 998812799 is about 31603.9997310467. Note that the first 3 decimals coincide. The cubic root of 998812799 is about 999.6041096248.

The spelling of 998812799 in words is "nine hundred ninety-eight million, eight hundred twelve thousand, seven hundred ninety-nine".