811538885 has 4 divisors (see below), whose sum is σ = 973846668. Its totient is φ = 649231104.

The previous prime is 811538869. The next prime is 811538927. The reversal of 811538885 is 588835118.

811538885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 338780836 + 472758049 = 18406^2 + 21743^2 .

It is a cyclic number.

It is not a de Polignac number, because 811538885 - 2⁴ = 811538869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81153884 + ... + 81153893.

It is an arithmetic number, because the mean of its divisors is an integer number (243461667).

Almost surely, 2^811538885 is an apocalyptic number.

It is an amenable number.

811538885 is a deficient number, since it is larger than the sum of its proper divisors (162307783).

811538885 is a wasteful number, since it uses less digits than its factorization.

811538885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162307782.

The product of its digits is 307200, while the sum is 47.

The square root of 811538885 is about 28487.5215664684. The cubic root of 811538885 is about 932.7597083936.

The spelling of 811538885 in words is "eight hundred eleven million, five hundred thirty-eight thousand, eight hundred eighty-five".