1115215521 has 16 divisors (see below), whose sum is σ = 1799339904. Its totient is φ = 599779584.

The previous prime is 1115215501. The next prime is 1115215529. The reversal of 1115215521 is 1255125111.

It is not a de Polignac number, because 1115215521 - 2⁵ = 1115215489 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1115215491 and 1115215500.

It is not an unprimeable number, because it can be changed into a prime (1115215529) 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, 1561570 + ... + 1562283.

It is an arithmetic number, because the mean of its divisors is an integer number (112458744).

Almost surely, 2^1115215521 is an apocalyptic number.

It is an amenable number.

1115215521 is a deficient number, since it is larger than the sum of its proper divisors (684124383).

1115215521 is a wasteful number, since it uses less digits than its factorization.

1115215521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123880.

The product of its digits is 500, while the sum is 24.

The square root of 1115215521 is about 33394.8427305774. The cubic root of 1115215521 is about 1037.0179370985.

The spelling of 1115215521 in words is "one billion, one hundred fifteen million, two hundred fifteen thousand, five hundred twenty-one".