814721085 has 20 divisors (see below), whose sum is σ = 1460463708. Its totient is φ = 434517696.

The previous prime is 814721069. The next prime is 814721087. The reversal of 814721085 is 580127418.

814721085 is a `hidden beast` number, since 81 + 472 + 108 + 5 = 666.

814721085 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 580906404 + 233814681 = 24102^2 + 15291^2 .

It is not a de Polignac number, because 814721085 - 2⁴ = 814721069 is a prime.

It is a super-3 number, since 3×814721085³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (814721087) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1005424 + ... + 1006233.

Almost surely, 2^814721085 is an apocalyptic number.

It is an amenable number.

814721085 is a deficient number, since it is larger than the sum of its proper divisors (645742623).

814721085 is a wasteful number, since it uses less digits than its factorization.

814721085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011674 (or 2011665 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 814721085 is about 28543.3194460630. The cubic root of 814721085 is about 933.9772950323.

The spelling of 814721085 in words is "eight hundred fourteen million, seven hundred twenty-one thousand, eighty-five".