63521545 has 4 divisors (see below), whose sum is σ = 76225860. Its totient is φ = 50817232.

The previous prime is 63521543. The next prime is 63521569. The reversal of 63521545 is 54512536.

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 7884864 + 55636681 = 2808^2 + 7459^2 .

It is a cyclic number.

It is not a de Polignac number, because 63521545 - 2¹ = 63521543 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 not an unprimeable number, because it can be changed into a prime (63521543) 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, 6352150 + ... + 6352159.

It is an arithmetic number, because the mean of its divisors is an integer number (19056465).

Almost surely, 2^63521545 is an apocalyptic number.

It is an amenable number.

63521545 is a deficient number, since it is larger than the sum of its proper divisors (12704315).

63521545 is a wasteful number, since it uses less digits than its factorization.

63521545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12704314.

The product of its digits is 18000, while the sum is 31.

The square root of 63521545 is about 7970.0404641382. The cubic root of 63521545 is about 399.0007244497. Note that the first 3 decimals are identical.

Subtracting from 63521545 its reverse (54512536), we obtain a palindrome (9009009).

The spelling of 63521545 in words is "sixty-three million, five hundred twenty-one thousand, five hundred forty-five".