1691061 has 8 divisors (see below), whose sum is σ = 2307360. Its totient is φ = 1101072.

The previous prime is 1691051. The next prime is 1691069. The reversal of 1691061 is 1601961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1691061 - 2⁷ = 1690933 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

1691061 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691069) 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 7 ways as a sum of consecutive naturals, for example, 6426 + ... + 6683.

It is an arithmetic number, because the mean of its divisors is an integer number (288420).

2^1691061 is an apocalyptic number.

It is an amenable number.

1691061 is a deficient number, since it is larger than the sum of its proper divisors (616299).

1691061 is a wasteful number, since it uses less digits than its factorization.

1691061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13155.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1691061 is about 1300.4080128944. The cubic root of 1691061 is about 119.1387642847.

The spelling of 1691061 in words is "one million, six hundred ninety-one thousand, sixty-one".