1689911 has 2 divisors, whose sum is σ = 1689912. Its totient is φ = 1689910.

The previous prime is 1689907. The next prime is 1689913. The reversal of 1689911 is 1199861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1689911 - 2² = 1689907 is a prime.

Together with 1689913, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1689913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844955 + 844956.

It is an arithmetic number, because the mean of its divisors is an integer number (844956).

2^1689911 is an apocalyptic number.

1689911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689911 is an equidigital number, since it uses as much as digits as its factorization.

1689911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 35.

The square root of 1689911 is about 1299.9657687801. The cubic root of 1689911 is about 119.1117515299. Note that the first 3 decimals are identical.

The spelling of 1689911 in words is "one million, six hundred eighty-nine thousand, nine hundred eleven".