197185213 has 2 divisors, whose sum is σ = 197185214. Its totient is φ = 197185212.

The previous prime is 197185199. The next prime is 197185217. The reversal of 197185213 is 312581791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193015449 + 4169764 = 13893^2 + 2042^2 .

It is an emirp because it is prime and its reverse (312581791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197185213 is a prime.

It is equal to p_10931788 and since 197185213 and 10931788 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197185217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98592606 + 98592607.

It is an arithmetic number, because the mean of its divisors is an integer number (98592607).

Almost surely, 2^197185213 is an apocalyptic number.

It is an amenable number.

197185213 is a deficient number, since it is larger than the sum of its proper divisors (1).

197185213 is an equidigital number, since it uses as much as digits as its factorization.

197185213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 37.

The square root of 197185213 is about 14042.2652374893. The cubic root of 197185213 is about 582.0470797561.

The spelling of 197185213 in words is "one hundred ninety-seven million, one hundred eighty-five thousand, two hundred thirteen".