198216397 has 2 divisors, whose sum is σ = 198216398. Its totient is φ = 198216396.

The previous prime is 198216349. The next prime is 198216401. The reversal of 198216397 is 793612891.

It is a happy number.

198216397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187854436 + 10361961 = 13706^2 + 3219^2 .

It is a cyclic number.

It is not a de Polignac number, because 198216397 - 2¹⁹ = 197692109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198216497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99108198 + 99108199.

It is an arithmetic number, because the mean of its divisors is an integer number (99108199).

Almost surely, 2^198216397 is an apocalyptic number.

It is an amenable number.

198216397 is a deficient number, since it is larger than the sum of its proper divisors (1).

198216397 is an equidigital number, since it uses as much as digits as its factorization.

198216397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 46.

The square root of 198216397 is about 14078.9345122420. The cubic root of 198216397 is about 583.0599251707.

The spelling of 198216397 in words is "one hundred ninety-eight million, two hundred sixteen thousand, three hundred ninety-seven".