199906117 has 2 divisors, whose sum is σ = 199906118. Its totient is φ = 199906116.

The previous prime is 199906093. The next prime is 199906127. The reversal of 199906117 is 711609991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199769956 + 136161 = 14134^2 + 369^2 .

It is a cyclic number.

It is not a de Polignac number, because 199906117 - 2¹⁹ = 199381829 is a prime.

It is a super-2 number, since 2×199906117² = 79924911228035378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199906127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99953058 + 99953059.

It is an arithmetic number, because the mean of its divisors is an integer number (99953059).

Almost surely, 2^199906117 is an apocalyptic number.

It is an amenable number.

199906117 is a deficient number, since it is larger than the sum of its proper divisors (1).

199906117 is an equidigital number, since it uses as much as digits as its factorization.

199906117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 43.

The square root of 199906117 is about 14138.8159688144. The cubic root of 199906117 is about 584.7120281351.

The spelling of 199906117 in words is "one hundred ninety-nine million, nine hundred six thousand, one hundred seventeen".