8181359451 has 32 divisors (see below), whose sum is σ = 12849715200. Its totient is φ = 5135620320.

The previous prime is 8181359449. The next prime is 8181359477. The reversal of 8181359451 is 1549531818.

8181359451 is a `hidden beast` number, since 8 + 1 + 8 + 1 + 3 + 594 + 51 = 666.

It is not a de Polignac number, because 8181359451 - 2¹ = 8181359449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8181359397 and 8181359406.

It is not an unprimeable number, because it can be changed into a prime (8181359411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101121 + ... + 163058.

It is an arithmetic number, because the mean of its divisors is an integer number (401553600).

Almost surely, 2^8181359451 is an apocalyptic number.

8181359451 is a deficient number, since it is larger than the sum of its proper divisors (4668355749).

8181359451 is a wasteful number, since it uses less digits than its factorization.

8181359451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264256 (or 264250 counting only the distinct ones).

The product of its digits is 172800, while the sum is 45.

The square root of 8181359451 is about 90450.8676077792. The cubic root of 8181359451 is about 2015.0004988228. Note that the first 3 decimals are identical.

The spelling of 8181359451 in words is "eight billion, one hundred eighty-one million, three hundred fifty-nine thousand, four hundred fifty-one".