199690129 has 2 divisors, whose sum is σ = 199690130. Its totient is φ = 199690128.

The previous prime is 199690093. The next prime is 199690157. The reversal of 199690129 is 921096991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183873600 + 15816529 = 13560^2 + 3977^2 .

It is a cyclic number.

It is not a de Polignac number, because 199690129 - 2¹⁷ = 199559057 is a prime.

It is a super-2 number, since 2×199690129² = 79752295240073282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199690229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99845064 + 99845065.

It is an arithmetic number, because the mean of its divisors is an integer number (99845065).

Almost surely, 2^199690129 is an apocalyptic number.

It is an amenable number.

199690129 is a deficient number, since it is larger than the sum of its proper divisors (1).

199690129 is an equidigital number, since it uses as much as digits as its factorization.

199690129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 46.

The square root of 199690129 is about 14131.1757826446. The cubic root of 199690129 is about 584.5013687612.

The spelling of 199690129 in words is "one hundred ninety-nine million, six hundred ninety thousand, one hundred twenty-nine".