861869217 has 8 divisors (see below), whose sum is σ = 1253628000. Its totient is φ = 522344960.

The previous prime is 861869189. The next prime is 861869237. The reversal of 861869217 is 712968168.

861869217 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 a cyclic number.

It is not a de Polignac number, because 861869217 - 2⁸ = 861868961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861869237) 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, 13058592 + ... + 13058657.

It is an arithmetic number, because the mean of its divisors is an integer number (156703500).

Almost surely, 2^861869217 is an apocalyptic number.

It is an amenable number.

861869217 is a deficient number, since it is larger than the sum of its proper divisors (391758783).

861869217 is a wasteful number, since it uses less digits than its factorization.

861869217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26117263.

The product of its digits is 290304, while the sum is 48.

The square root of 861869217 is about 29357.6091839918. The cubic root of 861869217 is about 951.6570220286.

It can be divided in two parts, 861 and 869217, that added together give a palindrome (870078).

The spelling of 861869217 in words is "eight hundred sixty-one million, eight hundred sixty-nine thousand, two hundred seventeen".