197716399 has 2 divisors, whose sum is σ = 197716400. Its totient is φ = 197716398.

The previous prime is 197716369. The next prime is 197716411. The reversal of 197716399 is 993617791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197716399 - 2⁵ = 197716367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197716369) 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, 98858199 + 98858200.

It is an arithmetic number, because the mean of its divisors is an integer number (98858200).

Almost surely, 2^197716399 is an apocalyptic number.

197716399 is a deficient number, since it is larger than the sum of its proper divisors (1).

197716399 is an equidigital number, since it uses as much as digits as its factorization.

197716399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 642978, while the sum is 52.

The square root of 197716399 is about 14061.1663456486. The cubic root of 197716399 is about 582.5692589583.

The spelling of 197716399 in words is "one hundred ninety-seven million, seven hundred sixteen thousand, three hundred ninety-nine".