8539423281 has 9 divisors (see below), whose sum is σ = 12335122969. Its totient is φ = 5692764036.

The previous prime is 8539423271. The next prime is 8539423303. The reversal of 8539423281 is 1823249358.

The square root of 8539423281 is 92409.

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

8539423281 is a `hidden beast` number, since 8 + 539 + 4 + 2 + 32 + 81 = 666.

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

It is not a de Polignac number, because 8539423281 - 2²⁵ = 8505868849 is a prime.

It is a super-2 number, since 2×8539423281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8539423241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 261826 + ... + 292628.

Almost surely, 2^8539423281 is an apocalyptic number.

8539423281 is the 92409-th square number.

8539423281 is the 46205-th centered octagonal number.

It is an amenable number.

8539423281 is a deficient number, since it is larger than the sum of its proper divisors (3795699688).

8539423281 is an frugal number, since it uses more digits than its factorization.

8539423281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61612 (or 30806 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The cubic root of 8539423281 is about 2043.9778274875.

The spelling of 8539423281 in words is "eight billion, five hundred thirty-nine million, four hundred twenty-three thousand, two hundred eighty-one".