197143979 has 2 divisors, whose sum is σ = 197143980. Its totient is φ = 197143978.

The previous prime is 197143967. The next prime is 197143987. The reversal of 197143979 is 979341791.

It is a happy number.

197143979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197143979 - 2¹⁶ = 197078443 is a prime.

It is not a weakly prime, because it can be changed into another prime (197143579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98571989 + 98571990.

It is an arithmetic number, because the mean of its divisors is an integer number (98571990).

Almost surely, 2^197143979 is an apocalyptic number.

197143979 is a deficient number, since it is larger than the sum of its proper divisors (1).

197143979 is an equidigital number, since it uses as much as digits as its factorization.

197143979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 50.

The square root of 197143979 is about 14040.7969503159. The cubic root of 197143979 is about 582.0065057157.

The spelling of 197143979 in words is "one hundred ninety-seven million, one hundred forty-three thousand, nine hundred seventy-nine".