197567989 has 2 divisors, whose sum is σ = 197567990. Its totient is φ = 197567988.

The previous prime is 197567987. The next prime is 197568011. The reversal of 197567989 is 989765791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197543025 + 24964 = 14055^2 + 158^2 .

It is a cyclic number.

It is not a de Polignac number, because 197567989 - 2¹ = 197567987 is a prime.

It is a super-2 number, since 2×197567989² = 78066220555008242, which contains 22 as substring.

Together with 197567987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197567983) 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, 98783994 + 98783995.

It is an arithmetic number, because the mean of its divisors is an integer number (98783995).

Almost surely, 2^197567989 is an apocalyptic number.

It is an amenable number.

197567989 is a deficient number, since it is larger than the sum of its proper divisors (1).

197567989 is an equidigital number, since it uses as much as digits as its factorization.

197567989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8573040, while the sum is 61.

The square root of 197567989 is about 14055.8880544774. Note that the first 3 decimals coincide. The cubic root of 197567989 is about 582.4234596453.

The spelling of 197567989 in words is "one hundred ninety-seven million, five hundred sixty-seven thousand, nine hundred eighty-nine".