861305331 has 8 divisors (see below), whose sum is σ = 1164582144. Its totient is φ = 566116040.

The previous prime is 861305303. The next prime is 861305363. The reversal of 861305331 is 133503168.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 861305331 - 2⁹ = 861304819 is a prime.

It is a super-2 number, since 2×861305331² = 1483693746418039122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (861305371) 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, 2021631 + ... + 2022056.

It is an arithmetic number, because the mean of its divisors is an integer number (145572768).

Almost surely, 2^861305331 is an apocalyptic number.

861305331 is a deficient number, since it is larger than the sum of its proper divisors (303276813).

861305331 is a wasteful number, since it uses less digits than its factorization.

861305331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4043761.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 861305331 is about 29348.0038673842. The cubic root of 861305331 is about 951.4494332459.

Adding to 861305331 its reverse (133503168), we get a palindrome (994808499).

The spelling of 861305331 in words is "eight hundred sixty-one million, three hundred five thousand, three hundred thirty-one".