197216399 has 2 divisors, whose sum is σ = 197216400. Its totient is φ = 197216398.

The previous prime is 197216359. The next prime is 197216417. The reversal of 197216399 is 993612791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197216399 - 2¹² = 197212303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197216359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98608199 + 98608200.

It is an arithmetic number, because the mean of its divisors is an integer number (98608200).

Almost surely, 2^197216399 is an apocalyptic number.

197216399 is a deficient number, since it is larger than the sum of its proper divisors (1).

197216399 is an equidigital number, since it uses as much as digits as its factorization.

197216399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 47.

The square root of 197216399 is about 14043.3756269638. The cubic root of 197216399 is about 582.0777628604.

The spelling of 197216399 in words is "one hundred ninety-seven million, two hundred sixteen thousand, three hundred ninety-nine".