2161481244 has 144 divisors (see below), whose sum is σ = 5791212000. Its totient is φ = 622992384.

The previous prime is 2161481239. The next prime is 2161481251. The reversal of 2161481244 is 4421841612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6193182 + ... + 6193530.

It is an arithmetic number, because the mean of its divisors is an integer number (40216750).

Almost surely, 2^2161481244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161481244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2895606000).

2161481244 is an abundant number, since it is smaller than the sum of its proper divisors (3629730756).

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

2161481244 is a wasteful number, since it uses less digits than its factorization.

2161481244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472 (or 433 counting only the distinct ones).

The product of its digits is 12288, while the sum is 33.

The square root of 2161481244 is about 46491.7330715903. The cubic root of 2161481244 is about 1292.9562320061.

The spelling of 2161481244 in words is "two billion, one hundred sixty-one million, four hundred eighty-one thousand, two hundred forty-four".