538505081 has 4 divisors (see below), whose sum is σ = 538564452. Its totient is φ = 538445712.

The previous prime is 538505021. The next prime is 538505117. The reversal of 538505081 is 180505835.

538505081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 180505835 = 5 ⋅36101167.

It can be written as a sum of positive squares in 2 ways, for example, as 349690000 + 188815081 = 18700^2 + 13741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-538505081 is a prime.

It is a super-2 number, since 2×538505081² = 579975444525633122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (538505021) 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, 12926 + ... + 35271.

It is an arithmetic number, because the mean of its divisors is an integer number (134641113).

Almost surely, 2^538505081 is an apocalyptic number.

It is an amenable number.

538505081 is a deficient number, since it is larger than the sum of its proper divisors (59371).

538505081 is a wasteful number, since it uses less digits than its factorization.

538505081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59370.

The product of its (nonzero) digits is 24000, while the sum is 35.

The square root of 538505081 is about 23205.7122493579. The cubic root of 538505081 is about 813.5731396515.

The spelling of 538505081 in words is "five hundred thirty-eight million, five hundred five thousand, eighty-one".