99998819 has 2 divisors, whose sum is σ = 99998820. Its totient is φ = 99998818.

The previous prime is 99998797. The next prime is 99998851. The reversal of 99998819 is 91889999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99998819 - 2¹² = 99994723 is a prime.

It is a super-2 number, since 2×99998819² = 19999527602789522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99998869) 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, 49999409 + 49999410.

It is an arithmetic number, because the mean of its divisors is an integer number (49999410).

Almost surely, 2^99998819 is an apocalyptic number.

99998819 is a deficient number, since it is larger than the sum of its proper divisors (1).

99998819 is an equidigital number, since it uses as much as digits as its factorization.

99998819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3779136, while the sum is 62.

The square root of 99998819 is about 9999.9409498257. The cubic root of 99998819 is about 464.1570561153.

The spelling of 99998819 in words is "ninety-nine million, nine hundred ninety-eight thousand, eight hundred nineteen".