197091197 has 2 divisors, whose sum is σ = 197091198. Its totient is φ = 197091196.

The previous prime is 197091179. The next prime is 197091233. The reversal of 197091197 is 791190791.

Together with previous prime (197091179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195049156 + 2042041 = 13966^2 + 1429^2 .

It is a cyclic number.

It is not a de Polignac number, because 197091197 - 2⁶ = 197091133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197091107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98545598 + 98545599.

It is an arithmetic number, because the mean of its divisors is an integer number (98545599).

Almost surely, 2^197091197 is an apocalyptic number.

It is an amenable number.

197091197 is a deficient number, since it is larger than the sum of its proper divisors (1).

197091197 is an equidigital number, since it uses as much as digits as its factorization.

197091197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35721, while the sum is 44.

The square root of 197091197 is about 14038.9172303280. The cubic root of 197091197 is about 581.9545602467.

The spelling of 197091197 in words is "one hundred ninety-seven million, ninety-one thousand, one hundred ninety-seven".