2161616 has 10 divisors (see below), whose sum is σ = 4188162. Its totient is φ = 1080800.

The previous prime is 2161613. The next prime is 2161633. The reversal of 2161616 is 6161612.

2161616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1201216 + 960400 = 1096^2 + 980^2 .

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 2161591 and 2161600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161613) 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 as a sum of consecutive naturals, namely, 67535 + ... + 67566.

2^2161616 is an apocalyptic number.

It is an amenable number.

2161616 is a deficient number, since it is larger than the sum of its proper divisors (2026546).

2161616 is a wasteful number, since it uses less digits than its factorization.

2161616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135109 (or 135103 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

The square root of 2161616 is about 1470.2435172447. The cubic root of 2161616 is about 129.2983100924.

The spelling of 2161616 in words is "two million, one hundred sixty-one thousand, six hundred sixteen".