196876721 has 2 divisors, whose sum is σ = 196876722. Its totient is φ = 196876720.

The previous prime is 196876703. The next prime is 196876733. The reversal of 196876721 is 127678691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120121600 + 76755121 = 10960^2 + 8761^2 .

It is a cyclic number.

It is not a de Polignac number, because 196876721 - 2⁶ = 196876657 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (196876751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98438360 + 98438361.

It is an arithmetic number, because the mean of its divisors is an integer number (98438361).

Almost surely, 2^196876721 is an apocalyptic number.

It is an amenable number.

196876721 is a deficient number, since it is larger than the sum of its proper divisors (1).

196876721 is an equidigital number, since it uses as much as digits as its factorization.

196876721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 47.

The square root of 196876721 is about 14031.2765278146. The cubic root of 196876721 is about 581.7433879730.

The spelling of 196876721 in words is "one hundred ninety-six million, eight hundred seventy-six thousand, seven hundred twenty-one".