197217689 has 2 divisors, whose sum is σ = 197217690. Its totient is φ = 197217688.

The previous prime is 197217679. The next prime is 197217743. The reversal of 197217689 is 986712791.

197217689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167055625 + 30162064 = 12925^2 + 5492^2 .

It is a cyclic number.

It is not a de Polignac number, because 197217689 - 2¹² = 197213593 is a prime.

It is a super-3 number, since 3×197217689³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (197217679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98608844 + 98608845.

It is an arithmetic number, because the mean of its divisors is an integer number (98608845).

Almost surely, 2^197217689 is an apocalyptic number.

It is an amenable number.

197217689 is a deficient number, since it is larger than the sum of its proper divisors (1).

197217689 is an equidigital number, since it uses as much as digits as its factorization.

197217689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 50.

The square root of 197217689 is about 14043.4215560169. The cubic root of 197217689 is about 582.0790319886.

The spelling of 197217689 in words is "one hundred ninety-seven million, two hundred seventeen thousand, six hundred eighty-nine".