861865231 has 8 divisors (see below), whose sum is σ = 872151840. Its totient is φ = 851592192.

The previous prime is 861865217. The next prime is 861865241. The reversal of 861865231 is 132568168.

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 861865231 - 2¹³ = 861857039 is a prime.

It is a super-2 number, since 2×861865231² = 1485623352813366722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861865241) 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, 185766 + ... + 190348.

It is an arithmetic number, because the mean of its divisors is an integer number (109018980).

Almost surely, 2^861865231 is an apocalyptic number.

861865231 is a deficient number, since it is larger than the sum of its proper divisors (10286609).

861865231 is a wasteful number, since it uses less digits than its factorization.

861865231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6785.

The product of its digits is 69120, while the sum is 40.

The square root of 861865231 is about 29357.5412969138. The cubic root of 861865231 is about 951.6555549419.

The spelling of 861865231 in words is "eight hundred sixty-one million, eight hundred sixty-five thousand, two hundred thirty-one".