197645099 has 2 divisors, whose sum is σ = 197645100. Its totient is φ = 197645098.

The previous prime is 197645039. The next prime is 197645117. The reversal of 197645099 is 990546791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197645099 - 2²⁰ = 196596523 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197645029) 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, 98822549 + 98822550.

It is an arithmetic number, because the mean of its divisors is an integer number (98822550).

Almost surely, 2^197645099 is an apocalyptic number.

197645099 is a deficient number, since it is larger than the sum of its proper divisors (1).

197645099 is an equidigital number, since it uses as much as digits as its factorization.

197645099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 197645099 is about 14058.6307654764. The cubic root of 197645099 is about 582.4992223092.

The spelling of 197645099 in words is "one hundred ninety-seven million, six hundred forty-five thousand, ninety-nine".