1689891899 has 2 divisors, whose sum is σ = 1689891900. Its totient is φ = 1689891898.

The previous prime is 1689891829. The next prime is 1689891911. The reversal of 1689891899 is 9981989861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1689891899 - 2²⁴ = 1673114683 is a prime.

It is not a weakly prime, because it can be changed into another prime (1689891829) 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, 844945949 + 844945950.

It is an arithmetic number, because the mean of its divisors is an integer number (844945950).

Almost surely, 2^1689891899 is an apocalyptic number.

1689891899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689891899 is an equidigital number, since it uses as much as digits as its factorization.

1689891899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20155392, while the sum is 68.

The square root of 1689891899 is about 41108.2947712502. The cubic root of 1689891899 is about 1191.1130275632.

The spelling of 1689891899 in words is "one billion, six hundred eighty-nine million, eight hundred ninety-one thousand, eight hundred ninety-nine".