63331521 has 12 divisors (see below), whose sum is σ = 92816976. Its totient is φ = 38382520.

The previous prime is 63331519. The next prime is 63331523. The reversal of 63331521 is 12513336.

It is a happy number.

63331521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (63331519) and next prime (63331523).

It is not a de Polignac number, because 63331521 - 2¹ = 63331519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 63331491 and 63331500.

It is not an unprimeable number, because it can be changed into a prime (63331523) 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 11 ways as a sum of consecutive naturals, for example, 86871 + ... + 87596.

It is an arithmetic number, because the mean of its divisors is an integer number (7734748).

Almost surely, 2^63331521 is an apocalyptic number.

It is an amenable number.

63331521 is a deficient number, since it is larger than the sum of its proper divisors (29485455).

63331521 is a wasteful number, since it uses less digits than its factorization.

63331521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174492 (or 174481 counting only the distinct ones).

The product of its digits is 1620, while the sum is 24.

The square root of 63331521 is about 7958.1103912926. The cubic root of 63331521 is about 398.6024582962.

Adding to 63331521 its reverse (12513336), we get a palindrome (75844857).

It can be divided in two parts, 633315 and 21, that added together give a palindrome (633336).

The spelling of 63331521 in words is "sixty-three million, three hundred thirty-one thousand, five hundred twenty-one".