1661103 has 6 divisors (see below), whose sum is σ = 2399384. Its totient is φ = 1107396.

The previous prime is 1661069. The next prime is 1661111. The reversal of 1661103 is 3011661.

1661103 is a `hidden beast` number, since 1 + 661 + 1 + 0 + 3 = 666.

It is not a de Polignac number, because 1661103 - 2¹⁴ = 1644719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661123) 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, 92275 + ... + 92292.

2^1661103 is an apocalyptic number.

1661103 is a deficient number, since it is larger than the sum of its proper divisors (738281).

1661103 is a wasteful number, since it uses less digits than its factorization.

1661103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184573 (or 184570 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1661103 is about 1288.8378486063. The cubic root of 1661103 is about 118.4310339501.

Adding to 1661103 its reverse (3011661), we get a palindrome (4672764).

It can be divided in two parts, 1661 and 103, that added together give a square (1764 = 42²).

The spelling of 1661103 in words is "one million, six hundred sixty-one thousand, one hundred three".