197496809 has 2 divisors, whose sum is σ = 197496810. Its totient is φ = 197496808.

The previous prime is 197496751. The next prime is 197496821. The reversal of 197496809 is 908694791.

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., 197486809 + 10000 = 14053^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 197496809 - 2⁸ = 197496553 is a prime.

It is not a weakly prime, because it can be changed into another prime (197496869) 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, 98748404 + 98748405.

It is an arithmetic number, because the mean of its divisors is an integer number (98748405).

Almost surely, 2^197496809 is an apocalyptic number.

It is an amenable number.

197496809 is a deficient number, since it is larger than the sum of its proper divisors (1).

197496809 is an equidigital number, since it uses as much as digits as its factorization.

197496809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 197496809 is about 14053.3557914115. The cubic root of 197496809 is about 582.3535058676.

The spelling of 197496809 in words is "one hundred ninety-seven million, four hundred ninety-six thousand, eight hundred nine".