199418369 has 2 divisors, whose sum is σ = 199418370. Its totient is φ = 199418368.

The previous prime is 199418363. The next prime is 199418371. The reversal of 199418369 is 963814991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136422400 + 62995969 = 11680^2 + 7937^2 .

It is an emirp because it is prime and its reverse (963814991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199418369 - 2⁴ = 199418353 is a prime.

It is a super-2 number, since 2×199418369² = 79535371789240322, which contains 22 as substring.

Together with 199418371, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199418363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99709184 + 99709185.

It is an arithmetic number, because the mean of its divisors is an integer number (99709185).

Almost surely, 2^199418369 is an apocalyptic number.

It is an amenable number.

199418369 is a deficient number, since it is larger than the sum of its proper divisors (1).

199418369 is an equidigital number, since it uses as much as digits as its factorization.

199418369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 50.

The square root of 199418369 is about 14121.5568900883. The cubic root of 199418369 is about 584.2360974218.

The spelling of 199418369 in words is "one hundred ninety-nine million, four hundred eighteen thousand, three hundred sixty-nine".