1689121 has 4 divisors (see below), whose sum is σ = 1930432. Its totient is φ = 1447812.

The previous prime is 1689113. The next prime is 1689167. The reversal of 1689121 is 1219861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1689121 - 2³ = 1689113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1689121.

It is not an unprimeable number, because it can be changed into a prime (1689521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120645 + ... + 120658.

It is an arithmetic number, because the mean of its divisors is an integer number (482608).

2^1689121 is an apocalyptic number.

It is an amenable number.

1689121 is a deficient number, since it is larger than the sum of its proper divisors (241311).

1689121 is an equidigital number, since it uses as much as digits as its factorization.

1689121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241310.

The product of its digits is 864, while the sum is 28.

The square root of 1689121 is about 1299.6618791055. The cubic root of 1689121 is about 119.0931878401.

The spelling of 1689121 in words is "one million, six hundred eighty-nine thousand, one hundred twenty-one".