197009 has 2 divisors, whose sum is σ = 197010. Its totient is φ = 197008.

The previous prime is 197003. The next prime is 197023. The reversal of 197009 is 900791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180625 + 16384 = 425^2 + 128^2 .

It is a cyclic number.

It is not a de Polignac number, because 197009 - 2⁴ = 196993 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (197003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98504 + 98505.

It is an arithmetic number, because the mean of its divisors is an integer number (98505).

2¹⁹⁷⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

197009 is a deficient number, since it is larger than the sum of its proper divisors (1).

197009 is an equidigital number, since it uses as much as digits as its factorization.

197009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567, while the sum is 26.

The square root of 197009 is about 443.8569589406. The cubic root of 197009 is about 58.1873647500.

The spelling of 197009 in words is "one hundred ninety-seven thousand, nine".