861832221 has 8 divisors (see below), whose sum is σ = 1216704384. Its totient is φ = 540757440.

The previous prime is 861832219. The next prime is 861832247. The reversal of 861832221 is 122238168.

861832221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 861832221 - 2¹ = 861832219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861832261) 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, 8449285 + ... + 8449386.

It is an arithmetic number, because the mean of its divisors is an integer number (152088048).

Almost surely, 2^861832221 is an apocalyptic number.

It is an amenable number.

861832221 is a deficient number, since it is larger than the sum of its proper divisors (354872163).

861832221 is a wasteful number, since it uses less digits than its factorization.

861832221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16898691.

The product of its digits is 9216, while the sum is 33.

The square root of 861832221 is about 29356.9790850489. The cubic root of 861832221 is about 951.6434051108.

The spelling of 861832221 in words is "eight hundred sixty-one million, eight hundred thirty-two thousand, two hundred twenty-one".