861288105 has 32 divisors (see below), whose sum is σ = 1395399168. Its totient is φ = 453600000.

The previous prime is 861288079. The next prime is 861288157. The reversal of 861288105 is 501882168.

It is not a de Polignac number, because 861288105 - 2⁵ = 861288073 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1137387 + ... + 1138143.

It is an arithmetic number, because the mean of its divisors is an integer number (43606224).

Almost surely, 2^861288105 is an apocalyptic number.

It is an amenable number.

861288105 is a deficient number, since it is larger than the sum of its proper divisors (534111063).

861288105 is a wasteful number, since it uses less digits than its factorization.

861288105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617.

The product of its (nonzero) digits is 30720, while the sum is 39.

The square root of 861288105 is about 29347.7103876946. The cubic root of 861288105 is about 951.4430902466.

The spelling of 861288105 in words is "eight hundred sixty-one million, two hundred eighty-eight thousand, one hundred five".