2161130225 has 24 divisors (see below), whose sum is σ = 2793386688. Its totient is φ = 1657022400.

The previous prime is 2161130189. The next prime is 2161130291. The reversal of 2161130225 is 5220311612.

It is not a de Polignac number, because 2161130225 - 2¹⁴ = 2161113841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2161130225.

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 23 ways as a sum of consecutive naturals, for example, 44540 + ... + 79410.

It is an arithmetic number, because the mean of its divisors is an integer number (116391112).

Almost surely, 2^2161130225 is an apocalyptic number.

2161130225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2161130225 is a deficient number, since it is larger than the sum of its proper divisors (632256463).

2161130225 is a wasteful number, since it uses less digits than its factorization.

2161130225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34985 (or 34980 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2161130225 is about 46487.9578493184. The cubic root of 2161130225 is about 1292.8862372937.

Adding to 2161130225 its reverse (5220311612), we get a palindrome (7381441837).

The spelling of 2161130225 in words is "two billion, one hundred sixty-one million, one hundred thirty thousand, two hundred twenty-five".