98999 has 2 divisors, whose sum is σ = 99000. Its totient is φ = 98998.

The previous prime is 98993. The next prime is 99013. The reversal of 98999 is 99989.

It is a weak prime.

It is an emirp because it is prime and its reverse (99989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98999 - 2¹² = 94903 is a prime.

It is a Chen prime.

98999 is a modest number, since divided by 999 gives 98 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49499 + 49500.

It is an arithmetic number, because the mean of its divisors is an integer number (49500).

2⁹⁸⁹⁹⁹ is an apocalyptic number.

98999 is a deficient number, since it is larger than the sum of its proper divisors (1).

98999 is an equidigital number, since it uses as much as digits as its factorization.

98999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 44.

The square root of 98999 is about 314.6410653427. The cubic root of 98999 is about 46.2604943315.

Subtracting 98999 from its reverse (99989), we obtain a triangular number (990 = T₄₄).

The spelling of 98999 in words is "ninety-eight thousand, nine hundred ninety-nine".