197667971 has 2 divisors, whose sum is σ = 197667972. Its totient is φ = 197667970.

The previous prime is 197667941. The next prime is 197667983. The reversal of 197667971 is 179766791.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197667971 - 2¹⁰ = 197666947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197667901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98833985 + 98833986.

It is an arithmetic number, because the mean of its divisors is an integer number (98833986).

Almost surely, 2^197667971 is an apocalyptic number.

197667971 is a deficient number, since it is larger than the sum of its proper divisors (1).

197667971 is an equidigital number, since it uses as much as digits as its factorization.

197667971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1000188, while the sum is 53.

The square root of 197667971 is about 14059.4441924281. Note that the first 3 decimals coincide. The cubic root of 197667971 is about 582.5216908794.

The spelling of 197667971 in words is "one hundred ninety-seven million, six hundred sixty-seven thousand, nine hundred seventy-one".