2181134178 has 24 divisors (see below), whose sum is σ = 4803265116. Its totient is φ = 715125600.

The previous prime is 2181134173. The next prime is 2181134209. The reversal of 2181134178 is 8714311812.

It can be written as a sum of positive squares in 2 ways, for example, as 2134717209 + 46416969 = 46203^2 + 6813^2 .

It is not an unprimeable number, because it can be changed into a prime (2181134171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 992133 + ... + 994328.

Almost surely, 2^2181134178 is an apocalyptic number.

2181134178 is an abundant number, since it is smaller than the sum of its proper divisors (2622130938).

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

2181134178 is a wasteful number, since it uses less digits than its factorization.

2181134178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986530 (or 1986527 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 2181134178 is about 46702.6142523093. The cubic root of 2181134178 is about 1296.8630832160.

The spelling of 2181134178 in words is "two billion, one hundred eighty-one million, one hundred thirty-four thousand, one hundred seventy-eight".