861338331 has 12 divisors (see below), whose sum is σ = 1421891952. Its totient is φ = 492193296.

The previous prime is 861338329. The next prime is 861338363. The reversal of 861338331 is 133833168.

861338331 is a `hidden beast` number, since 8 + 613 + 3 + 8 + 3 + 31 = 666.

It is not a de Polignac number, because 861338331 - 2¹ = 861338329 is a prime.

It is a super-3 number, since 3×861338331³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (861330331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6835956 + ... + 6836081.

It is an arithmetic number, because the mean of its divisors is an integer number (118490996).

Almost surely, 2^861338331 is an apocalyptic number.

861338331 is a deficient number, since it is larger than the sum of its proper divisors (560553621).

861338331 is a wasteful number, since it uses less digits than its factorization.

861338331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13672050 (or 13672047 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 861338331 is about 29348.5660808156. The cubic root of 861338331 is about 951.4615843493.

The spelling of 861338331 in words is "eight hundred sixty-one million, three hundred thirty-eight thousand, three hundred thirty-one".