196720217 has 4 divisors (see below), whose sum is σ = 196857060. Its totient is φ = 196583376.

The previous prime is 196720207. The next prime is 196720247. The reversal of 196720217 is 712027691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 178195801 + 18524416 = 13349^2 + 4304^2 .

It is a cyclic number.

It is not a de Polignac number, because 196720217 - 2⁴ = 196720201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196720207) 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, 66242 + ... + 69147.

It is an arithmetic number, because the mean of its divisors is an integer number (49214265).

Almost surely, 2^196720217 is an apocalyptic number.

It is an amenable number.

196720217 is a deficient number, since it is larger than the sum of its proper divisors (136843).

196720217 is a wasteful number, since it uses less digits than its factorization.

196720217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136842.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 196720217 is about 14025.6984496317. The cubic root of 196720217 is about 581.5891979087.

The spelling of 196720217 in words is "one hundred ninety-six million, seven hundred twenty thousand, two hundred seventeen".