3539518721 has 12 divisors (see below), whose sum is σ = 3741153300. Its totient is φ = 3348256608.

The previous prime is 3539518709. The next prime is 3539518733. The reversal of 3539518721 is 1278159353.

It is an interprime number because it is at equal distance from previous prime (3539518709) and next prime (3539518733).

It can be written as a sum of positive squares in 2 ways, for example, as 503508721 + 3036010000 = 22439^2 + 55100^2 .

It is not a de Polignac number, because 3539518721 - 2¹⁰ = 3539517697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3539518421) 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, 249035 + ... + 262863.

It is an arithmetic number, because the mean of its divisors is an integer number (311762775).

Almost surely, 2^3539518721 is an apocalyptic number.

It is an amenable number.

3539518721 is a deficient number, since it is larger than the sum of its proper divisors (201634579).

3539518721 is a wasteful number, since it uses less digits than its factorization.

3539518721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14576 (or 14557 counting only the distinct ones).

The product of its digits is 226800, while the sum is 44.

The square root of 3539518721 is about 59493.8544809462. The cubic root of 3539518721 is about 1523.9874989789.

The spelling of 3539518721 in words is "three billion, five hundred thirty-nine million, five hundred eighteen thousand, seven hundred twenty-one".