1689115889 has 2 divisors, whose sum is σ = 1689115890. Its totient is φ = 1689115888.

The previous prime is 1689115877. The next prime is 1689115891. The reversal of 1689115889 is 9885119861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1075315264 + 613800625 = 32792^2 + 24775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689115889 - 2⁴ = 1689115873 is a prime.

It is a super-2 number, since 2×1689115889² = 5706224972944520642, which contains 22 as substring.

Together with 1689115891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1689112889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844557944 + 844557945.

It is an arithmetic number, because the mean of its divisors is an integer number (844557945).

Almost surely, 2^1689115889 is an apocalyptic number.

It is an amenable number.

1689115889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689115889 is an equidigital number, since it uses as much as digits as its factorization.

1689115889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 56.

The square root of 1689115889 is about 41098.8550813767. The cubic root of 1689115889 is about 1190.9306772126.

The spelling of 1689115889 in words is "one billion, six hundred eighty-nine million, one hundred fifteen thousand, eight hundred eighty-nine".