63521873 has 4 divisors (see below), whose sum is σ = 63554868. Its totient is φ = 63488880.

The previous prime is 63521869. The next prime is 63521891. The reversal of 63521873 is 37812536.

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 25230529 + 38291344 = 5023^2 + 6188^2 .

It is a cyclic number.

It is not a de Polignac number, because 63521873 - 2² = 63521869 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63521893) 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, 13418 + ... + 17523.

It is an arithmetic number, because the mean of its divisors is an integer number (15888717).

Almost surely, 2^63521873 is an apocalyptic number.

It is an amenable number.

63521873 is a deficient number, since it is larger than the sum of its proper divisors (32995).

63521873 is a wasteful number, since it uses less digits than its factorization.

63521873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32994.

The product of its digits is 30240, while the sum is 35.

The square root of 63521873 is about 7970.0610411715. The cubic root of 63521873 is about 399.0014112089.

The spelling of 63521873 in words is "sixty-three million, five hundred twenty-one thousand, eight hundred seventy-three".