197993189 has 2 divisors, whose sum is σ = 197993190. Its totient is φ = 197993188.

The previous prime is 197993183. The next prime is 197993221. The reversal of 197993189 is 981399791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188842564 + 9150625 = 13742^2 + 3025^2 .

It is a cyclic number.

It is not a de Polignac number, because 197993189 - 2⁸ = 197992933 is a prime.

It is a Sophie Germain prime.

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 (197993183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98996594 + 98996595.

It is an arithmetic number, because the mean of its divisors is an integer number (98996595).

Almost surely, 2^197993189 is an apocalyptic number.

It is an amenable number.

197993189 is a deficient number, since it is larger than the sum of its proper divisors (1).

197993189 is an equidigital number, since it uses as much as digits as its factorization.

197993189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 56.

The square root of 197993189 is about 14071.0052590424. The cubic root of 197993189 is about 582.8409851248.

The spelling of 197993189 in words is "one hundred ninety-seven million, nine hundred ninety-three thousand, one hundred eighty-nine".