197161 has 2 divisors, whose sum is σ = 197162. Its totient is φ = 197160.

The previous prime is 197159. The next prime is 197203. The reversal of 197161 is 161791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197136 + 25 = 444^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 197161 - 2¹ = 197159 is a prime.

Together with 197159, it forms a pair of twin primes.

197161 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (197101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98580 + 98581.

It is an arithmetic number, because the mean of its divisors is an integer number (98581).

2¹⁹⁷¹⁶¹ is an apocalyptic number.

It is an amenable number.

197161 is a deficient number, since it is larger than the sum of its proper divisors (1).

197161 is an equidigital number, since it uses as much as digits as its factorization.

197161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378, while the sum is 25.

The square root of 197161 is about 444.0281522606. The cubic root of 197161 is about 58.2023254976.

Subtracting from 197161 its sum of digits (25), we obtain a square (197136 = 444²).

The spelling of 197161 in words is "one hundred ninety-seven thousand, one hundred sixty-one".