539987761 has 4 divisors (see below), whose sum is σ = 540034852. Its totient is φ = 539940672.

The previous prime is 539987759. The next prime is 539987783. The reversal of 539987761 is 167789935.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 167789935 = 5 ⋅33557987.

It can be written as a sum of positive squares in 2 ways, for example, as 351337536 + 188650225 = 18744^2 + 13735^2 .

It is a cyclic number.

It is not a de Polignac number, because 539987761 - 2¹ = 539987759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (539967761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6085 + ... + 33421.

It is an arithmetic number, because the mean of its divisors is an integer number (135008713).

Almost surely, 2^539987761 is an apocalyptic number.

It is an amenable number.

539987761 is a deficient number, since it is larger than the sum of its proper divisors (47091).

539987761 is a wasteful number, since it uses less digits than its factorization.

539987761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47090.

The product of its digits is 2857680, while the sum is 55.

The square root of 539987761 is about 23237.6367344014. The cubic root of 539987761 is about 814.3191327547.

The spelling of 539987761 in words is "five hundred thirty-nine million, nine hundred eighty-seven thousand, seven hundred sixty-one".