2161044 has 18 divisors (see below), whose sum is σ = 5462730. Its totient is φ = 720336.

The previous prime is 2161031. The next prime is 2161087. The reversal of 2161044 is 4401612.

It can be written as a sum of positive squares in only one way, i.e., 2160900 + 144 = 1470^2 + 12^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×2161044² = 9340222339872, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29979 + ... + 30050.

It is an arithmetic number, because the mean of its divisors is an integer number (303485).

2^2161044 is an apocalyptic number.

It is an amenable number.

2161044 is an abundant number, since it is smaller than the sum of its proper divisors (3301686).

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

2161044 is a wasteful number, since it uses less digits than its factorization.

2161044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60039 (or 60034 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 2161044 is about 1470.0489787759. The cubic root of 2161044 is about 129.2869042495.

Adding to 2161044 its reverse (4401612), we get a palindrome (6562656).

The spelling of 2161044 in words is "two million, one hundred sixty-one thousand, forty-four".