198721199 has 2 divisors, whose sum is σ = 198721200. Its totient is φ = 198721198.

The previous prime is 198721169. The next prime is 198721207. The reversal of 198721199 is 991127891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198721199 - 2¹⁶ = 198655663 is a prime.

It is a super-2 number, since 2×198721199² = 78980229863995202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198721139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99360599 + 99360600.

It is an arithmetic number, because the mean of its divisors is an integer number (99360600).

Almost surely, 2^198721199 is an apocalyptic number.

198721199 is a deficient number, since it is larger than the sum of its proper divisors (1).

198721199 is an equidigital number, since it uses as much as digits as its factorization.

198721199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 47.

The square root of 198721199 is about 14096.8506766582. The cubic root of 198721199 is about 583.5544693743.

The spelling of 198721199 in words is "one hundred ninety-eight million, seven hundred twenty-one thousand, one hundred ninety-nine".