197864489 has 2 divisors, whose sum is σ = 197864490. Its totient is φ = 197864488.

The previous prime is 197864449. The next prime is 197864497. The reversal of 197864489 is 984468791.

197864489 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., 190219264 + 7645225 = 13792^2 + 2765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197864489 is a prime.

It is a super-2 number, since 2×197864489² = 78300712014462242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197864449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98932244 + 98932245.

It is an arithmetic number, because the mean of its divisors is an integer number (98932245).

Almost surely, 2^197864489 is an apocalyptic number.

It is an amenable number.

197864489 is a deficient number, since it is larger than the sum of its proper divisors (1).

197864489 is an equidigital number, since it uses as much as digits as its factorization.

197864489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 56.

The square root of 197864489 is about 14066.4312816009. The cubic root of 197864489 is about 582.7146711943.

The spelling of 197864489 in words is "one hundred ninety-seven million, eight hundred sixty-four thousand, four hundred eighty-nine".