1691128 has 16 divisors (see below), whose sum is σ = 3196080. Its totient is φ = 838848.

The previous prime is 1691119. The next prime is 1691141. The reversal of 1691128 is 8211961.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1691096 and 1691105.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 325 + ... + 1867.

It is an arithmetic number, because the mean of its divisors is an integer number (199755).

2^1691128 is an apocalyptic number.

It is an amenable number.

1691128 is a deficient number, since it is larger than the sum of its proper divisors (1504952).

1691128 is a wasteful number, since it uses less digits than its factorization.

1691128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686 (or 1682 counting only the distinct ones).

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

The square root of 1691128 is about 1300.4337737847. The cubic root of 1691128 is about 119.1403376937.

The spelling of 1691128 in words is "one million, six hundred ninety-one thousand, one hundred twenty-eight".