197871097 has 2 divisors, whose sum is σ = 197871098. Its totient is φ = 197871096.

The previous prime is 197871077. The next prime is 197871103. The reversal of 197871097 is 790178791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158482921 + 39388176 = 12589^2 + 6276^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197871097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197871097.

It is not a weakly prime, because it can be changed into another prime (197871077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98935548 + 98935549.

It is an arithmetic number, because the mean of its divisors is an integer number (98935549).

Almost surely, 2^197871097 is an apocalyptic number.

It is an amenable number.

197871097 is a deficient number, since it is larger than the sum of its proper divisors (1).

197871097 is an equidigital number, since it uses as much as digits as its factorization.

197871097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 222264, while the sum is 49.

The square root of 197871097 is about 14066.6661650869. Note that the first 3 decimals coincide. The cubic root of 197871097 is about 582.7211580172.

The spelling of 197871097 in words is "one hundred ninety-seven million, eight hundred seventy-one thousand, ninety-seven".