197545979 has 2 divisors, whose sum is σ = 197545980. Its totient is φ = 197545978.

The previous prime is 197545951. The next prime is 197546023. The reversal of 197545979 is 979545791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197545979 - 2²⁰ = 196497403 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (197545939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98772989 + 98772990.

It is an arithmetic number, because the mean of its divisors is an integer number (98772990).

Almost surely, 2^197545979 is an apocalyptic number.

197545979 is a deficient number, since it is larger than the sum of its proper divisors (1).

197545979 is an equidigital number, since it uses as much as digits as its factorization.

197545979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3572100, while the sum is 56.

The square root of 197545979 is about 14055.1050867647. The cubic root of 197545979 is about 582.4018306077.

The spelling of 197545979 in words is "one hundred ninety-seven million, five hundred forty-five thousand, nine hundred seventy-nine".