197738213 has 2 divisors, whose sum is σ = 197738214. Its totient is φ = 197738212.

The previous prime is 197738179. The next prime is 197738221. The reversal of 197738213 is 312837791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196056004 + 1682209 = 14002^2 + 1297^2 .

It is a cyclic number.

It is not a de Polignac number, because 197738213 - 2¹⁴ = 197721829 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 (197738273) 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, 98869106 + 98869107.

It is an arithmetic number, because the mean of its divisors is an integer number (98869107).

Almost surely, 2^197738213 is an apocalyptic number.

It is an amenable number.

197738213 is a deficient number, since it is larger than the sum of its proper divisors (1).

197738213 is an equidigital number, since it uses as much as digits as its factorization.

197738213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 41.

The square root of 197738213 is about 14061.9420067073. The cubic root of 197738213 is about 582.5906830765.

The spelling of 197738213 in words is "one hundred ninety-seven million, seven hundred thirty-eight thousand, two hundred thirteen".