1661116 has 12 divisors (see below), whose sum is σ = 2948400. Its totient is φ = 818720.

The previous prime is 1661111. The next prime is 1661117. The reversal of 1661116 is 6111661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2641 + ... + 3208.

It is an arithmetic number, because the mean of its divisors is an integer number (245700).

2^1661116 is an apocalyptic number.

It is an amenable number.

1661116 is a deficient number, since it is larger than the sum of its proper divisors (1287284).

1661116 is a wasteful number, since it uses less digits than its factorization.

1661116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5924 (or 5922 counting only the distinct ones).

The product of its digits is 216, while the sum is 22.

The square root of 1661116 is about 1288.8428918996. The cubic root of 1661116 is about 118.4313429013.

Adding to 1661116 its reverse (6111661), we get a palindrome (7772777).

The spelling of 1661116 in words is "one million, six hundred sixty-one thousand, one hundred sixteen".