861611217 has 8 divisors (see below), whose sum is σ = 1154647296. Its totient is φ = 571491312.

The previous prime is 861611213. The next prime is 861611237. The reversal of 861611217 is 712116168.

It is a happy number.

861611217 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 861611217 - 2² = 861611213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861611213) 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, 728353 + ... + 729534.

It is an arithmetic number, because the mean of its divisors is an integer number (144330912).

Almost surely, 2^861611217 is an apocalyptic number.

It is an amenable number.

861611217 is a deficient number, since it is larger than the sum of its proper divisors (293036079).

861611217 is a wasteful number, since it uses less digits than its factorization.

861611217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458087.

The product of its digits is 4032, while the sum is 33.

The square root of 861611217 is about 29353.2147643150. The cubic root of 861611217 is about 951.5620532444.

It can be divided in two parts, 86161 and 1217, that added together give a palindrome (87378).

The spelling of 861611217 in words is "eight hundred sixty-one million, six hundred eleven thousand, two hundred seventeen".