6318819081 has 9 divisors (see below), whose sum is σ = 9127527591. Its totient is φ = 4212387072.

The previous prime is 6318819071. The next prime is 6318819119. The reversal of 6318819081 is 1809188136.

The square root of 6318819081 is 79491.

It is a perfect power (a square), and thus also a powerful number.

6318819081 is a `hidden beast` number, since 631 + 8 + 8 + 1 + 9 + 0 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5781321225 + 537497856 = 76035^2 + 23184^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-6318819081 is a prime.

It is a super-2 number, since 2×6318819081² = 79854949156819369122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6318819061) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 225225 + ... + 251721.

Almost surely, 2^6318819081 is an apocalyptic number.

6318819081 is the 79491-st square number.

6318819081 is the 39746-th centered octagonal number.

It is an amenable number.

6318819081 is a deficient number, since it is larger than the sum of its proper divisors (2808708510).

6318819081 is an frugal number, since it uses more digits than its factorization.

6318819081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53000 (or 26500 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The cubic root of 6318819081 is about 1848.7519296637.

Multiplying 6318819081 by its product of nonzero digits (82944), we get a square (524108129854464 = 22893408²).

The spelling of 6318819081 in words is "six billion, three hundred eighteen million, eight hundred nineteen thousand, eighty-one".