1689431 has 2 divisors, whose sum is σ = 1689432. Its totient is φ = 1689430.

The previous prime is 1689397. The next prime is 1689437. The reversal of 1689431 is 1349861.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1689431 - 2⁶ = 1689367 is a prime.

It is a super-2 number, since 2×1689431² = 5708354207522, which contains 22 as substring.

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 (1689437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844715 + 844716.

It is an arithmetic number, because the mean of its divisors is an integer number (844716).

2^1689431 is an apocalyptic number.

1689431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689431 is an equidigital number, since it uses as much as digits as its factorization.

1689431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 1689431 is about 1299.7811354224. The cubic root of 1689431 is about 119.1004730159.

The spelling of 1689431 in words is "one million, six hundred eighty-nine thousand, four hundred thirty-one".