63013521 has 8 divisors (see below), whose sum is σ = 84482944. Its totient is φ = 41776560.

The previous prime is 63013499. The next prime is 63013523. The reversal of 63013521 is 12531036.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63013521 - 2⁷ = 63013393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63013523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57481 + ... + 58566.

It is an arithmetic number, because the mean of its divisors is an integer number (10560368).

Almost surely, 2^63013521 is an apocalyptic number.

It is an amenable number.

63013521 is a deficient number, since it is larger than the sum of its proper divisors (21469423).

63013521 is a wasteful number, since it uses less digits than its factorization.

63013521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116231.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 63013521 is about 7938.1056304385. The cubic root of 63013521 is about 397.9341848024.

Adding to 63013521 its reverse (12531036), we get a palindrome (75544557).

The spelling of 63013521 in words is "sixty-three million, thirteen thousand, five hundred twenty-one".