1691109 has 24 divisors (see below), whose sum is σ = 2957760. Its totient is φ = 908928.

The previous prime is 1691101. The next prime is 1691113. The reversal of 1691109 is 9011961.

It is not a de Polignac number, because 1691109 - 2³ = 1691101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691101) 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 in 23 ways as a sum of consecutive naturals, for example, 282 + ... + 1860.

It is an arithmetic number, because the mean of its divisors is an integer number (123240).

2^1691109 is an apocalyptic number.

It is an amenable number.

1691109 is a deficient number, since it is larger than the sum of its proper divisors (1266651).

1691109 is a wasteful number, since it uses less digits than its factorization.

1691109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609 (or 1606 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 1691109 is about 1300.4264685095. The cubic root of 1691109 is about 119.1398915073.

It can be divided in two parts, 16 and 91109, that added together give a cube (91125 = 45³).

The spelling of 1691109 in words is "one million, six hundred ninety-one thousand, one hundred nine".