861326331 has 4 divisors (see below), whose sum is σ = 1148435112. Its totient is φ = 574217552.

The previous prime is 861326321. The next prime is 861326357. The reversal of 861326331 is 133623168.

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

It is a cyclic number.

It is not a de Polignac number, because 861326331 - 2⁵ = 861326299 is a prime.

It is a super-2 number, since 2×861326331² = 1483766096947843122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 861326292 and 861326301.

It is not an unprimeable number, because it can be changed into a prime (861326311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143554386 + ... + 143554391.

It is an arithmetic number, because the mean of its divisors is an integer number (287108778).

Almost surely, 2^861326331 is an apocalyptic number.

861326331 is a deficient number, since it is larger than the sum of its proper divisors (287108781).

861326331 is a wasteful number, since it uses less digits than its factorization.

861326331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287108780.

The product of its digits is 15552, while the sum is 33.

The square root of 861326331 is about 29348.3616408140. The cubic root of 861326331 is about 951.4571658021.

Adding to 861326331 its reverse (133623168), we get a palindrome (994949499).

The spelling of 861326331 in words is "eight hundred sixty-one million, three hundred twenty-six thousand, three hundred thirty-one".