2155044145 has 4 divisors (see below), whose sum is σ = 2586052980. Its totient is φ = 1724035312.

The previous prime is 2155044139. The next prime is 2155044161. The reversal of 2155044145 is 5414405512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 261662976 + 1893381169 = 16176^2 + 43513^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155044145 - 2³ = 2155044137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215504410 + ... + 215504419.

It is an arithmetic number, because the mean of its divisors is an integer number (646513245).

Almost surely, 2^2155044145 is an apocalyptic number.

It is an amenable number.

2155044145 is a deficient number, since it is larger than the sum of its proper divisors (431008835).

2155044145 is an equidigital number, since it uses as much as digits as its factorization.

2155044145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431008834.

The product of its (nonzero) digits is 16000, while the sum is 31.

The square root of 2155044145 is about 46422.4530265259. The cubic root of 2155044145 is about 1291.6714397511.

Adding to 2155044145 its reverse (5414405512), we get a palindrome (7569449657).

The spelling of 2155044145 in words is "two billion, one hundred fifty-five million, forty-four thousand, one hundred forty-five".