196728121 has 2 divisors, whose sum is σ = 196728122. Its totient is φ = 196728120.

The previous prime is 196728107. The next prime is 196728143. The reversal of 196728121 is 121827691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145805625 + 50922496 = 12075^2 + 7136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196728121 is a prime.

It is not a weakly prime, because it can be changed into another prime (196728101) 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 as a sum of consecutive naturals, namely, 98364060 + 98364061.

It is an arithmetic number, because the mean of its divisors is an integer number (98364061).

Almost surely, 2^196728121 is an apocalyptic number.

It is an amenable number.

196728121 is a deficient number, since it is larger than the sum of its proper divisors (1).

196728121 is an equidigital number, since it uses as much as digits as its factorization.

196728121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 37.

The square root of 196728121 is about 14025.9802153005. The cubic root of 196728121 is about 581.5969870072.

The spelling of 196728121 in words is "one hundred ninety-six million, seven hundred twenty-eight thousand, one hundred twenty-one".