2161081152 has 84 divisors (see below), whose sum is σ = 6207495840. Its totient is φ = 718831872.

The previous prime is 2161081133. The next prime is 2161081183. The reversal of 2161081152 is 2511801612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 285999 + ... + 293457.

It is an arithmetic number, because the mean of its divisors is an integer number (73898760).

Almost surely, 2^2161081152 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 2161081152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3103747920).

2161081152 is an abundant number, since it is smaller than the sum of its proper divisors (4046414688).

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

2161081152 is a wasteful number, since it uses less digits than its factorization.

2161081152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7980 (or 7967 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 2161081152 is about 46487.4300429697. The cubic root of 2161081152 is about 1292.8764513206.

Adding to 2161081152 its reverse (2511801612), we get a palindrome (4672882764).

The spelling of 2161081152 in words is "two billion, one hundred sixty-one million, eighty-one thousand, one hundred fifty-two".