63572521 has 4 divisors (see below), whose sum is σ = 64036692. Its totient is φ = 63108352.

The previous prime is 63572513. The next prime is 63572567. The reversal of 63572521 is 12527536.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26666896 + 36905625 = 5164^2 + 6075^2 .

It is a cyclic number.

It is not a de Polignac number, because 63572521 - 2³ = 63572513 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63572021) 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, 231880 + ... + 232153.

It is an arithmetic number, because the mean of its divisors is an integer number (16009173).

Almost surely, 2^63572521 is an apocalyptic number.

It is an amenable number.

63572521 is a deficient number, since it is larger than the sum of its proper divisors (464171).

63572521 is a wasteful number, since it uses less digits than its factorization.

63572521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464170.

The product of its digits is 12600, while the sum is 31.

The square root of 63572521 is about 7973.2377990375. The cubic root of 63572521 is about 399.1074285218.

The spelling of 63572521 in words is "sixty-three million, five hundred seventy-two thousand, five hundred twenty-one".