998877799 has 2 divisors, whose sum is σ = 998877800. Its totient is φ = 998877798.

The previous prime is 998877797. The next prime is 998877809. The reversal of 998877799 is 997778899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998877799 - 2¹ = 998877797 is a prime.

Together with 998877797, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998877791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499438899 + 499438900.

It is an arithmetic number, because the mean of its divisors is an integer number (499438900).

Almost surely, 2^998877799 is an apocalyptic number.

998877799 is a deficient number, since it is larger than the sum of its proper divisors (1).

998877799 is an equidigital number, since it uses as much as digits as its factorization.

998877799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144027072, while the sum is 73.

The square root of 998877799 is about 31605.0280651671. The cubic root of 998877799 is about 999.6257929866.

The spelling of 998877799 in words is "nine hundred ninety-eight million, eight hundred seventy-seven thousand, seven hundred ninety-nine".