861347331 has 32 divisors (see below), whose sum is σ = 1376934720. Its totient is φ = 529016832.

The previous prime is 861347329. The next prime is 861347339. The reversal of 861347331 is 133743168.

861347331 is a `hidden beast` number, since 8 + 613 + 4 + 7 + 3 + 31 = 666.

861347331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 861347331 - 2¹ = 861347329 is a prime.

It is a super-2 number, since 2×861347331² = 1483838449241647122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (861347339) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 200401 + ... + 204653.

It is an arithmetic number, because the mean of its divisors is an integer number (43029210).

Almost surely, 2^861347331 is an apocalyptic number.

861347331 is a deficient number, since it is larger than the sum of its proper divisors (515587389).

861347331 is a wasteful number, since it uses less digits than its factorization.

861347331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4852 (or 4846 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 861347331 is about 29348.7194098823. The cubic root of 861347331 is about 951.4648982327.

The spelling of 861347331 in words is "eight hundred sixty-one million, three hundred forty-seven thousand, three hundred thirty-one".