8463139281 has 20 divisors (see below), whose sum is σ = 13078418100. Its totient is φ = 5447536416.

The previous prime is 8463139261. The next prime is 8463139313. The reversal of 8463139281 is 1829313648.

8463139281 is a `hidden beast` number, since 8 + 4 + 631 + 3 + 9 + 2 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3630665025 + 4832474256 = 60255^2 + 69516^2 .

It is not a de Polignac number, because 8463139281 - 2⁵ = 8463139249 is a prime.

It is a super-2 number, since 2×8463139281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8463139261) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1799086 + ... + 1803783.

It is an arithmetic number, because the mean of its divisors is an integer number (653920905).

Almost surely, 2^8463139281 is an apocalyptic number.

8463139281 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8463139281 is a deficient number, since it is larger than the sum of its proper divisors (4615278819).

8463139281 is a wasteful number, since it uses less digits than its factorization.

8463139281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3602910 (or 3602901 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 8463139281 is about 91995.3220604178. The cubic root of 8463139281 is about 2037.8732225381.

The spelling of 8463139281 in words is "eight billion, four hundred sixty-three million, one hundred thirty-nine thousand, two hundred eighty-one".