199938169 has 2 divisors, whose sum is σ = 199938170. Its totient is φ = 199938168.

The previous prime is 199938163. The next prime is 199938191. The reversal of 199938169 is 961839991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143688169 + 56250000 = 11987^2 + 7500^2 .

It is a cyclic number.

It is not a de Polignac number, because 199938169 - 2³ = 199938161 is a prime.

It is a super-2 number, since 2×199938169² = 79950542846145122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199938161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99969084 + 99969085.

It is an arithmetic number, because the mean of its divisors is an integer number (99969085).

Almost surely, 2^199938169 is an apocalyptic number.

It is an amenable number.

199938169 is a deficient number, since it is larger than the sum of its proper divisors (1).

199938169 is an equidigital number, since it uses as much as digits as its factorization.

199938169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 944784, while the sum is 55.

The square root of 199938169 is about 14139.9493987779. The cubic root of 199938169 is about 584.7432764508.

The spelling of 199938169 in words is "one hundred ninety-nine million, nine hundred thirty-eight thousand, one hundred sixty-nine".