2015521055 has 4 divisors (see below), whose sum is σ = 2418625272. Its totient is φ = 1612416840.

The previous prime is 2015521049. The next prime is 2015521093. The reversal of 2015521055 is 5501255102.

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

It is not a de Polignac number, because 2015521055 - 2¹⁴ = 2015504671 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 201552101 + ... + 201552110.

It is an arithmetic number, because the mean of its divisors is an integer number (604656318).

Almost surely, 2^2015521055 is an apocalyptic number.

2015521055 is a deficient number, since it is larger than the sum of its proper divisors (403104217).

2015521055 is an equidigital number, since it uses as much as digits as its factorization.

2015521055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403104216.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 2015521055 is about 44894.5548479991. The cubic root of 2015521055 is about 1263.1718722943.

Adding to 2015521055 its reverse (5501255102), we get a palindrome (7516776157).

The spelling of 2015521055 in words is "two billion, fifteen million, five hundred twenty-one thousand, fifty-five".