197608181 has 2 divisors, whose sum is σ = 197608182. Its totient is φ = 197608180.

The previous prime is 197608141. The next prime is 197608183. The reversal of 197608181 is 181806791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131446225 + 66161956 = 11465^2 + 8134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197608181 is a prime.

It is a super-2 number, since 2×197608181² = 78097986396257522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 197608183, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197608183) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98804090 + 98804091.

It is an arithmetic number, because the mean of its divisors is an integer number (98804091).

Almost surely, 2^197608181 is an apocalyptic number.

It is an amenable number.

197608181 is a deficient number, since it is larger than the sum of its proper divisors (1).

197608181 is an equidigital number, since it uses as much as digits as its factorization.

197608181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 41.

The square root of 197608181 is about 14057.3177028905. The cubic root of 197608181 is about 582.4629518333.

The spelling of 197608181 in words is "one hundred ninety-seven million, six hundred eight thousand, one hundred eighty-one".