181604197 has 2 divisors, whose sum is σ = 181604198. Its totient is φ = 181604196.

The previous prime is 181604131. The next prime is 181604201. The reversal of 181604197 is 791406181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99321156 + 82283041 = 9966^2 + 9071^2 .

It is a cyclic number.

It is not a de Polignac number, because 181604197 - 2¹¹ = 181602149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181604497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90802098 + 90802099.

It is an arithmetic number, because the mean of its divisors is an integer number (90802099).

Almost surely, 2^181604197 is an apocalyptic number.

It is an amenable number.

181604197 is a deficient number, since it is larger than the sum of its proper divisors (1).

181604197 is an equidigital number, since it uses as much as digits as its factorization.

181604197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 181604197 is about 13476.0601438254. The cubic root of 181604197 is about 566.2940002227.

The spelling of 181604197 in words is "one hundred eighty-one million, six hundred four thousand, one hundred ninety-seven".