8211785481 has 8 divisors (see below), whose sum is σ = 12165608160. Its totient is φ = 5474523636.

The previous prime is 8211785479. The next prime is 8211785501. The reversal of 8211785481 is 1845871128.

8211785481 is a `hidden beast` number, since 82 + 1 + 17 + 85 + 481 = 666.

It is not a de Polignac number, because 8211785481 - 2¹ = 8211785479 is a prime.

It is a super-2 number, since 2×8211785481² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8211785581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152070075 + ... + 152070128.

It is an arithmetic number, because the mean of its divisors is an integer number (1520701020).

Almost surely, 2^8211785481 is an apocalyptic number.

It is an amenable number.

8211785481 is a deficient number, since it is larger than the sum of its proper divisors (3953822679).

8211785481 is a wasteful number, since it uses less digits than its factorization.

8211785481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304140212 (or 304140206 counting only the distinct ones).

The product of its digits is 143360, while the sum is 45.

The square root of 8211785481 is about 90618.9024486613. The cubic root of 8211785481 is about 2017.4953010490.

The spelling of 8211785481 in words is "eight billion, two hundred eleven million, seven hundred eighty-five thousand, four hundred eighty-one".