1689071 has 2 divisors, whose sum is σ = 1689072. Its totient is φ = 1689070.

The previous prime is 1689067. The next prime is 1689109. The reversal of 1689071 is 1709861.

It is a weak prime.

It is an emirp because it is prime and its reverse (1709861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1689071 - 2² = 1689067 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1689031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844535 + 844536.

It is an arithmetic number, because the mean of its divisors is an integer number (844536).

2^1689071 is an apocalyptic number.

1689071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689071 is an equidigital number, since it uses as much as digits as its factorization.

1689071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 1689071 is about 1299.6426431908. The cubic root of 1689071 is about 119.0920127283.

It can be divided in two parts, 16890 and 71, that added together give a palindrome (16961).

The spelling of 1689071 in words is "one million, six hundred eighty-nine thousand, seventy-one".