199996129 has 4 divisors (see below), whose sum is σ = 202735876. Its totient is φ = 197256384.

The previous prime is 199996117. The next prime is 199996141. The reversal of 199996129 is 921699991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 921699991 = 643 ⋅1433437.

It is an interprime number because it is at equal distance from previous prime (199996117) and next prime (199996141).

It can be written as a sum of positive squares in 2 ways, for example, as 129436129 + 70560000 = 11377^2 + 8400^2 .

It is a cyclic number.

It is not a de Polignac number, because 199996129 - 2¹⁹ = 199471841 is a prime.

It is a super-2 number, since 2×199996129² = 79996903229969282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199996129.

It is not an unprimeable number, because it can be changed into a prime (199996169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1369764 + ... + 1369909.

It is an arithmetic number, because the mean of its divisors is an integer number (50683969).

Almost surely, 2^199996129 is an apocalyptic number.

It is an amenable number.

199996129 is a deficient number, since it is larger than the sum of its proper divisors (2739747).

199996129 is an equidigital number, since it uses as much as digits as its factorization.

199996129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739746.

The product of its digits is 708588, while the sum is 55.

The square root of 199996129 is about 14141.9987625512. The cubic root of 199996129 is about 584.7997746607.

The spelling of 199996129 in words is "one hundred ninety-nine million, nine hundred ninety-six thousand, one hundred twenty-nine".