2155531144 has 16 divisors (see below), whose sum is σ = 4352515020. Its totient is φ = 994860480.

The previous prime is 2155531141. The next prime is 2155531159. The reversal of 2155531144 is 4411355512.

It can be written as a sum of positive squares in 2 ways, for example, as 1963376100 + 192155044 = 44310^2 + 13862^2 .

It is not an unprimeable number, because it can be changed into a prime (2155531141) 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 3 ways as a sum of consecutive naturals, for example, 10363027 + ... + 10363234.

Almost surely, 2^2155531144 is an apocalyptic number.

It is an amenable number.

2155531144 is an abundant number, since it is smaller than the sum of its proper divisors (2196983876).

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

2155531144 is a wasteful number, since it uses less digits than its factorization.

2155531144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20726280 (or 20726276 counting only the distinct ones).

The product of its digits is 12000, while the sum is 31.

The square root of 2155531144 is about 46427.6980260706. The cubic root of 2155531144 is about 1291.7687301513.

Adding to 2155531144 its reverse (4411355512), we get a palindrome (6566886656).

The spelling of 2155531144 in words is "two billion, one hundred fifty-five million, five hundred thirty-one thousand, one hundred forty-four".