861301831 has 8 divisors (see below), whose sum is σ = 927957744. Its totient is φ = 794703360.

The previous prime is 861301823. The next prime is 861301849. The reversal of 861301831 is 138103168.

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 861301831 - 2³ = 861301823 is a prime.

It is a super-2 number, since 2×861301831² = 1483681688167905122, 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 = 861301793 and 861301802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861301031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19815 + ... + 45991.

It is an arithmetic number, because the mean of its divisors is an integer number (115994718).

Almost surely, 2^861301831 is an apocalyptic number.

861301831 is a deficient number, since it is larger than the sum of its proper divisors (66655913).

861301831 is a wasteful number, since it uses less digits than its factorization.

861301831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28721.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 861301831 is about 29347.9442380552. The cubic root of 861301831 is about 951.4481444743.

Adding to 861301831 its reverse (138103168), we get a palindrome (999404999).

The spelling of 861301831 in words is "eight hundred sixty-one million, three hundred one thousand, eight hundred thirty-one".