861317905 has 16 divisors (see below), whose sum is σ = 1182096000. Its totient is φ = 590188032.

The previous prime is 861317867. The next prime is 861317909. The reversal of 861317905 is 509713168.

861317905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 861317905 - 2¹¹ = 861315857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861317909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44257 + ... + 60673.

It is an arithmetic number, because the mean of its divisors is an integer number (73881000).

Almost surely, 2^861317905 is an apocalyptic number.

It is an amenable number.

861317905 is a deficient number, since it is larger than the sum of its proper divisors (320778095).

861317905 is a wasteful number, since it uses less digits than its factorization.

861317905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17928.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 861317905 is about 29348.2180890084. The cubic root of 861317905 is about 951.4540632211.

The spelling of 861317905 in words is "eight hundred sixty-one million, three hundred seventeen thousand, nine hundred five".