2155522145 has 16 divisors (see below), whose sum is σ = 2961349248. Its totient is φ = 1475470080.

The previous prime is 2155522141. The next prime is 2155522153. The reversal of 2155522145 is 5412255512.

It is a happy number.

It is not a de Polignac number, because 2155522145 - 2² = 2155522141 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155522141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33944 + ... + 73913.

It is an arithmetic number, because the mean of its divisors is an integer number (185084328).

Almost surely, 2^2155522145 is an apocalyptic number.

It is an amenable number.

2155522145 is a deficient number, since it is larger than the sum of its proper divisors (805827103).

2155522145 is a wasteful number, since it uses less digits than its factorization.

2155522145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108440.

The product of its digits is 20000, while the sum is 32.

The square root of 2155522145 is about 46427.6011118386. The cubic root of 2155522145 is about 1291.7669325057.

Adding to 2155522145 its reverse (5412255512), we get a palindrome (7567777657).

The spelling of 2155522145 in words is "two billion, one hundred fifty-five million, five hundred twenty-two thousand, one hundred forty-five".