861170805 has 64 divisors (see below), whose sum is σ = 1727827200. Its totient is φ = 403119360.

The previous prime is 861170803. The next prime is 861170809. The reversal of 861170805 is 508071168.

It is not a de Polignac number, because 861170805 - 2¹ = 861170803 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 861170805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861170803) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33067 + ... + 53063.

It is an arithmetic number, because the mean of its divisors is an integer number (26997300).

Almost surely, 2^861170805 is an apocalyptic number.

It is an amenable number.

861170805 is an abundant number, since it is smaller than the sum of its proper divisors (866656395).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861170805 is a wasteful number, since it uses less digits than its factorization.

861170805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20051 (or 20045 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 861170805 is about 29345.7118673240. The cubic root of 861170805 is about 951.3998955089.

The spelling of 861170805 in words is "eight hundred sixty-one million, one hundred seventy thousand, eight hundred five".