1661112 has 24 divisors (see below), whose sum is σ = 4499040. Its totient is φ = 553680.

The previous prime is 1661111. The next prime is 1661117. The reversal of 1661112 is 2111661.

1661112 is a `hidden beast` number, since 1 + 661 + 1 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

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 polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11464 + ... + 11607.

It is an arithmetic number, because the mean of its divisors is an integer number (187460).

2^1661112 is an apocalyptic number.

1661112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1661112 is an abundant number, since it is smaller than the sum of its proper divisors (2837928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661112 is a wasteful number, since it uses less digits than its factorization.

1661112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23083 (or 23076 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1661112 is about 1288.8413401191. The cubic root of 1661112 is about 118.4312478396.

Adding to 1661112 its reverse (2111661), we get a palindrome (3772773).

The spelling of 1661112 in words is "one million, six hundred sixty-one thousand, one hundred twelve".