2015015521 has 2 divisors, whose sum is σ = 2015015522. Its totient is φ = 2015015520.

The previous prime is 2015015489. The next prime is 2015015557. The reversal of 2015015521 is 1255105102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1899216400 + 115799121 = 43580^2 + 10761^2 .

It is a cyclic number.

It is not a de Polignac number, because 2015015521 - 2⁵ = 2015015489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2015015492 and 2015015501.

It is not a weakly prime, because it can be changed into another prime (2015015581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1007507760 + 1007507761.

It is an arithmetic number, because the mean of its divisors is an integer number (1007507761).

Almost surely, 2^2015015521 is an apocalyptic number.

It is an amenable number.

2015015521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2015015521 is an equidigital number, since it uses as much as digits as its factorization.

2015015521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 2015015521 is about 44888.9242575493. The cubic root of 2015015521 is about 1263.0662536629.

The spelling of 2015015521 in words is "two billion, fifteen million, fifteen thousand, five hundred twenty-one".