1115255521 has 8 divisors (see below), whose sum is σ = 1196104320. Its totient is φ = 1036621872.

The previous prime is 1115255513. The next prime is 1115255563. The reversal of 1115255521 is 1255525111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1115255521 - 2³ = 1115255513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1115255521.

It is not an unprimeable number, because it can be changed into a prime (1115205521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552745 + ... + 554758.

It is an arithmetic number, because the mean of its divisors is an integer number (149513040).

Almost surely, 2^1115255521 is an apocalyptic number.

It is an amenable number.

1115255521 is a deficient number, since it is larger than the sum of its proper divisors (80848799).

1115255521 is a wasteful number, since it uses less digits than its factorization.

1115255521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107575.

The product of its digits is 2500, while the sum is 28.

The square root of 1115255521 is about 33395.4416200774. The cubic root of 1115255521 is about 1037.0303353662.

The spelling of 1115255521 in words is "one billion, one hundred fifteen million, two hundred fifty-five thousand, five hundred twenty-one".