5181681208 has 32 divisors (see below), whose sum is σ = 10603010160. Its totient is φ = 2354394880.

The previous prime is 5181681199. The next prime is 5181681221. The reversal of 5181681208 is 8021861815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250260 + ... + 270172.

Almost surely, 2^5181681208 is an apocalyptic number.

It is an amenable number.

5181681208 is an abundant number, since it is smaller than the sum of its proper divisors (5421328952).

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

5181681208 is a wasteful number, since it uses less digits than its factorization.

5181681208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22887 (or 22883 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 40.

The square root of 5181681208 is about 71983.8954766967. The cubic root of 5181681208 is about 1730.4413998381.

The spelling of 5181681208 in words is "five billion, one hundred eighty-one million, six hundred eighty-one thousand, two hundred eight".