199217129 has 4 divisors (see below), whose sum is σ = 205643520. Its totient is φ = 192790740.

The previous prime is 199217119. The next prime is 199217131. The reversal of 199217129 is 921712991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 921712991 = 25147 ⋅36653.

It is a cyclic number.

It is not a de Polignac number, because 199217129 - 2⁴ = 199217113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199217119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3213149 + ... + 3213210.

It is an arithmetic number, because the mean of its divisors is an integer number (51410880).

Almost surely, 2^199217129 is an apocalyptic number.

It is an amenable number.

199217129 is a deficient number, since it is larger than the sum of its proper divisors (6426391).

199217129 is an equidigital number, since it uses as much as digits as its factorization.

199217129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6426390.

The product of its digits is 20412, while the sum is 41.

The square root of 199217129 is about 14114.4298149093. The cubic root of 199217129 is about 584.0395069680.

The spelling of 199217129 in words is "one hundred ninety-nine million, two hundred seventeen thousand, one hundred twenty-nine".