861080231 has 4 divisors (see below), whose sum is σ = 939360264. Its totient is φ = 782800200.

The previous prime is 861080221. The next prime is 861080287. The reversal of 861080231 is 132080168.

861080231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861080231 is a prime.

It is a super-2 number, since 2×861080231² = 1482918328438026722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 861080194 and 861080203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861080201) 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, 39140000 + ... + 39140021.

It is an arithmetic number, because the mean of its divisors is an integer number (234840066).

Almost surely, 2^861080231 is an apocalyptic number.

861080231 is a deficient number, since it is larger than the sum of its proper divisors (78280033).

861080231 is a wasteful number, since it uses less digits than its factorization.

861080231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78280032.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 861080231 is about 29344.1686029780. The cubic root of 861080231 is about 951.3665397120.

The spelling of 861080231 in words is "eight hundred sixty-one million, eighty thousand, two hundred thirty-one".