196805909 has 2 divisors, whose sum is σ = 196805910. Its totient is φ = 196805908.

The previous prime is 196805899. The next prime is 196805927. The reversal of 196805909 is 909508691.

196805909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131033809 + 65772100 = 11447^2 + 8110^2 .

It is a cyclic number.

It is not a de Polignac number, because 196805909 - 2⁴ = 196805893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196805929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98402954 + 98402955.

It is an arithmetic number, because the mean of its divisors is an integer number (98402955).

Almost surely, 2^196805909 is an apocalyptic number.

It is an amenable number.

196805909 is a deficient number, since it is larger than the sum of its proper divisors (1).

196805909 is an equidigital number, since it uses as much as digits as its factorization.

196805909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 196805909 is about 14028.7529381624. The cubic root of 196805909 is about 581.6736330650.

The spelling of 196805909 in words is "one hundred ninety-six million, eight hundred five thousand, nine hundred nine".