1661118 has 16 divisors (see below), whose sum is σ = 3338496. Its totient is φ = 551000.

The previous prime is 1661117. The next prime is 1661123. The reversal of 1661118 is 8111661.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 955 + ... + 2057.

It is an arithmetic number, because the mean of its divisors is an integer number (208656).

2^1661118 is an apocalyptic number.

1661118 is an abundant number, since it is smaller than the sum of its proper divisors (1677378).

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

1661118 is a wasteful number, since it uses less digits than its factorization.

1661118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359.

The product of its digits is 288, while the sum is 24.

The square root of 1661118 is about 1288.8436677891. The cubic root of 1661118 is about 118.4313904321.

Adding to 1661118 its reverse (8111661), we get a palindrome (9772779).

The spelling of 1661118 in words is "one million, six hundred sixty-one thousand, one hundred eighteen".