2161131360 has 96 divisors (see below), whose sum is σ = 6820837632. Its totient is φ = 575178240.

The previous prime is 2161131353. The next prime is 2161131377. The reversal of 2161131360 is 631311612.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2161131360.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258445 + ... + 266675.

It is an arithmetic number, because the mean of its divisors is an integer number (71050392).

Almost surely, 2^2161131360 is an apocalyptic number.

2161131360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161131360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3410418816).

2161131360 is an abundant number, since it is smaller than the sum of its proper divisors (4659706272).

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

2161131360 is a wasteful number, since it uses less digits than its factorization.

2161131360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8796 (or 8788 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 2161131360 is about 46487.9700567792. The cubic root of 2161131360 is about 1292.8864636298.

Adding to 2161131360 its reverse (631311612), we get a palindrome (2792442972).

The spelling of 2161131360 in words is "two billion, one hundred sixty-one million, one hundred thirty-one thousand, three hundred sixty".