8539479981 has 12 divisors (see below), whose sum is σ = 12337352352. Its totient is φ = 5691810696.

The previous prime is 8539479953. The next prime is 8539480013. The reversal of 8539479981 is 1899749358.

8539479981 is a `hidden beast` number, since 8 + 539 + 4 + 7 + 9 + 98 + 1 = 666.

It is not a de Polignac number, because 8539479981 - 2⁶ = 8539479917 is a prime.

It is a super-2 number, since 2×8539479981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8539479901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50811 + ... + 140216.

It is an arithmetic number, because the mean of its divisors is an integer number (1028112696).

Almost surely, 2^8539479981 is an apocalyptic number.

It is an amenable number.

8539479981 is a deficient number, since it is larger than the sum of its proper divisors (3797872371).

8539479981 is a wasteful number, since it uses less digits than its factorization.

8539479981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196000 (or 195997 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 63.

The square root of 8539479981 is about 92409.3067877906. The cubic root of 8539479981 is about 2043.9823513405.

The spelling of 8539479981 in words is "eight billion, five hundred thirty-nine million, four hundred seventy-nine thousand, nine hundred eighty-one".