538647521 has 4 divisors (see below), whose sum is σ = 547777200. Its totient is φ = 529517844.

The previous prime is 538647481. The next prime is 538647563. The reversal of 538647521 is 125746835.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 538647521 - 2⁶ = 538647457 is a prime.

It is a super-3 number, since 3×538647521³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (538647121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4564751 + ... + 4564868.

It is an arithmetic number, because the mean of its divisors is an integer number (136944300).

Almost surely, 2^538647521 is an apocalyptic number.

It is an amenable number.

538647521 is a deficient number, since it is larger than the sum of its proper divisors (9129679).

538647521 is an equidigital number, since it uses as much as digits as its factorization.

538647521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9129678.

The product of its digits is 201600, while the sum is 41.

The square root of 538647521 is about 23208.7811183612. The cubic root of 538647521 is about 813.6448660821.

The spelling of 538647521 in words is "five hundred thirty-eight million, six hundred forty-seven thousand, five hundred twenty-one".