815221116 has 36 divisors (see below), whose sum is σ = 2068326624. Its totient is φ = 270734400.

The previous prime is 815221109. The next prime is 815221159. The reversal of 815221116 is 611122518.

815221116 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 815221116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32025 + ... + 51536.

Almost surely, 2^815221116 is an apocalyptic number.

It is an amenable number.

815221116 is an abundant number, since it is smaller than the sum of its proper divisors (1253105508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

815221116 is a wasteful number, since it uses less digits than its factorization.

815221116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83842 (or 83837 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 815221116 is about 28552.0772624340. The cubic root of 815221116 is about 934.1683305898.

The spelling of 815221116 in words is "eight hundred fifteen million, two hundred twenty-one thousand, one hundred sixteen".