198908719 has 2 divisors, whose sum is σ = 198908720. Its totient is φ = 198908718.

The previous prime is 198908657. The next prime is 198908779. The reversal of 198908719 is 917809891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198908719 is a prime.

It is a super-2 number, since 2×198908719² = 79129356988441922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198908779) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99454359 + 99454360.

It is an arithmetic number, because the mean of its divisors is an integer number (99454360).

Almost surely, 2^198908719 is an apocalyptic number.

198908719 is a deficient number, since it is larger than the sum of its proper divisors (1).

198908719 is an equidigital number, since it uses as much as digits as its factorization.

198908719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 52.

The square root of 198908719 is about 14103.5002393023. The cubic root of 198908719 is about 583.7379655365.

The spelling of 198908719 in words is "one hundred ninety-eight million, nine hundred eight thousand, seven hundred nineteen".