198718859 has 2 divisors, whose sum is σ = 198718860. Its totient is φ = 198718858.

The previous prime is 198718837. The next prime is 198718909. The reversal of 198718859 is 958817891.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198718859 is a prime.

It is not a weakly prime, because it can be changed into another prime (198711859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99359429 + 99359430.

It is an arithmetic number, because the mean of its divisors is an integer number (99359430).

Almost surely, 2^198718859 is an apocalyptic number.

198718859 is a deficient number, since it is larger than the sum of its proper divisors (1).

198718859 is an equidigital number, since it uses as much as digits as its factorization.

198718859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 56.

The square root of 198718859 is about 14096.7676791526. The cubic root of 198718859 is about 583.5521788573.

The spelling of 198718859 in words is "one hundred ninety-eight million, seven hundred eighteen thousand, eight hundred fifty-nine".