1689531 has 16 divisors (see below), whose sum is σ = 2393088. Its totient is φ = 1058400.

The previous prime is 1689521. The next prime is 1689533. The reversal of 1689531 is 1359861.

It is a de Polignac number, because none of the positive numbers 2^k-1689531 is a prime.

It is a super-2 number, since 2×1689531² = 5709029999922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1689492 and 1689501.

It is not an unprimeable number, because it can be changed into a prime (1689533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3196 + ... + 3686.

It is an arithmetic number, because the mean of its divisors is an integer number (149568).

2^1689531 is an apocalyptic number.

1689531 is a deficient number, since it is larger than the sum of its proper divisors (703557).

1689531 is a wasteful number, since it uses less digits than its factorization.

1689531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562.

The product of its digits is 6480, while the sum is 33.

The square root of 1689531 is about 1299.8196028680. The cubic root of 1689531 is about 119.1028228824.

The spelling of 1689531 in words is "one million, six hundred eighty-nine thousand, five hundred thirty-one".