4539681 has 12 divisors (see below), whose sum is σ = 6665620. Its totient is φ = 2976480.

The previous prime is 4539679. The next prime is 4539701. The reversal of 4539681 is 1869354.

It can be written as a sum of positive squares in 2 ways, for example, as 2030625 + 2509056 = 1425^2 + 1584^2 .

It is not a de Polignac number, because 4539681 - 2¹ = 4539679 is a prime.

It is a super-4 number, since 4×4539681⁴ (a number of 28 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4539481) 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, 3586 + ... + 4683.

Almost surely, 2^4539681 is an apocalyptic number.

It is an amenable number.

4539681 is a deficient number, since it is larger than the sum of its proper divisors (2125939).

4539681 is a wasteful number, since it uses less digits than its factorization.

4539681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8336 (or 8333 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 4539681 is about 2130.6527168922. The cubic root of 4539681 is about 165.5802162531.

The spelling of 4539681 in words is "four million, five hundred thirty-nine thousand, six hundred eighty-one".