865180813 has 16 divisors (see below), whose sum is σ = 1051933824. Its totient is φ = 694632960.

The previous prime is 865180793. The next prime is 865180819. The reversal of 865180813 is 318081568.

865180813 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 865180813 - 2⁵ = 865180781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865180819) 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, 7881 + ... + 42337.

It is an arithmetic number, because the mean of its divisors is an integer number (65745864).

Almost surely, 2^865180813 is an apocalyptic number.

It is an amenable number.

865180813 is a deficient number, since it is larger than the sum of its proper divisors (186753011).

865180813 is a wasteful number, since it uses less digits than its factorization.

865180813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34692.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 865180813 is about 29413.9560923042. The cubic root of 865180813 is about 952.8743280635.

The spelling of 865180813 in words is "eight hundred sixty-five million, one hundred eighty thousand, eight hundred thirteen".