196581709 has 2 divisors, whose sum is σ = 196581710. Its totient is φ = 196581708.

The previous prime is 196581647. The next prime is 196581719. The reversal of 196581709 is 907185691.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186322500 + 10259209 = 13650^2 + 3203^2 .

It is a cyclic number.

It is not a de Polignac number, because 196581709 - 2⁹ = 196581197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196581719) 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, 98290854 + 98290855.

It is an arithmetic number, because the mean of its divisors is an integer number (98290855).

Almost surely, 2^196581709 is an apocalyptic number.

It is an amenable number.

196581709 is a deficient number, since it is larger than the sum of its proper divisors (1).

196581709 is an equidigital number, since it uses as much as digits as its factorization.

196581709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 196581709 is about 14020.7599294760. The cubic root of 196581709 is about 581.4526695418.

The spelling of 196581709 in words is "one hundred ninety-six million, five hundred eighty-one thousand, seven hundred nine".