1661133 has 16 divisors (see below), whose sum is σ = 2309120. Its totient is φ = 1061424.

The previous prime is 1661123. The next prime is 1661137. The reversal of 1661133 is 3311661.

It is not a de Polignac number, because 1661133 - 2⁴ = 1661117 is a prime.

It is a Duffinian number.

1661133 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661137) 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 15 ways as a sum of consecutive naturals, for example, 10110 + ... + 10272.

It is an arithmetic number, because the mean of its divisors is an integer number (144320).

2^1661133 is an apocalyptic number.

It is an amenable number.

1661133 is a deficient number, since it is larger than the sum of its proper divisors (647987).

1661133 is a wasteful number, since it uses less digits than its factorization.

1661133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288.

The product of its digits is 324, while the sum is 21.

The square root of 1661133 is about 1288.8494869456. The cubic root of 1661133 is about 118.4317469120.

Adding to 1661133 its reverse (3311661), we get a palindrome (4972794).

The spelling of 1661133 in words is "one million, six hundred sixty-one thousand, one hundred thirty-three".