861178113 has 18 divisors (see below), whose sum is σ = 1288308294. Its totient is φ = 554316672.

The previous prime is 861178103. The next prime is 861178117. The reversal of 861178113 is 311871168.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1046529 + 860131584 = 1023^2 + 29328^2 .

It is not a de Polignac number, because 861178113 - 2⁵ = 861178081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861178117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 49320 + ... + 64457.

It is an arithmetic number, because the mean of its divisors is an integer number (71572683).

Almost surely, 2^861178113 is an apocalyptic number.

It is an amenable number.

861178113 is a deficient number, since it is larger than the sum of its proper divisors (427130181).

861178113 is a wasteful number, since it uses less digits than its factorization.

861178113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113841 (or 113809 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 861178113 is about 29345.8363826966. The cubic root of 861178113 is about 951.4025867330.

The spelling of 861178113 in words is "eight hundred sixty-one million, one hundred seventy-eight thousand, one hundred thirteen".