2153181285 has 20 divisors (see below), whose sum is σ = 3859777548. Its totient is φ = 1148363136.

The previous prime is 2153181281. The next prime is 2153181323. The reversal of 2153181285 is 5821813512.

2153181285 is a `hidden beast` number, since 21 + 531 + 81 + 28 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 830477124 + 1322704161 = 28818^2 + 36369^2 .

It is not a de Polignac number, because 2153181285 - 2² = 2153181281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2153181281) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 2657844 + ... + 2658653.

Almost surely, 2^2153181285 is an apocalyptic number.

It is an amenable number.

2153181285 is a deficient number, since it is larger than the sum of its proper divisors (1706596263).

2153181285 is an equidigital number, since it uses as much as digits as its factorization.

2153181285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5316514 (or 5316505 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 2153181285 is about 46402.3844753694. The cubic root of 2153181285 is about 1291.2991509020.

Adding to 2153181285 its reverse (5821813512), we get a palindrome (7974994797).

The spelling of 2153181285 in words is "two billion, one hundred fifty-three million, one hundred eighty-one thousand, two hundred eighty-five".