63539521 has 4 divisors (see below), whose sum is σ = 63562752. Its totient is φ = 63516292.

The previous prime is 63539513. The next prime is 63539537. The reversal of 63539521 is 12593536.

It is a happy number.

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 63539521 - 2³ = 63539513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63539221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6865 + ... + 13198.

It is an arithmetic number, because the mean of its divisors is an integer number (15890688).

Almost surely, 2^63539521 is an apocalyptic number.

It is an amenable number.

63539521 is a deficient number, since it is larger than the sum of its proper divisors (23231).

63539521 is a wasteful number, since it uses less digits than its factorization.

63539521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23230.

The product of its digits is 24300, while the sum is 34.

The square root of 63539521 is about 7971.1681076239. The cubic root of 63539521 is about 399.0383587178.

The spelling of 63539521 in words is "sixty-three million, five hundred thirty-nine thousand, five hundred twenty-one".