63453521 has 4 divisors (see below), whose sum is σ = 66793200. Its totient is φ = 60113844.

The previous prime is 63453493. The next prime is 63453539. The reversal of 63453521 is 12535436.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63453521 - 2²² = 59259217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63453721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1669811 + ... + 1669848.

It is an arithmetic number, because the mean of its divisors is an integer number (16698300).

Almost surely, 2^63453521 is an apocalyptic number.

It is an amenable number.

63453521 is a deficient number, since it is larger than the sum of its proper divisors (3339679).

63453521 is a wasteful number, since it uses less digits than its factorization.

63453521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3339678.

The product of its digits is 10800, while the sum is 29.

The square root of 63453521 is about 7965.7718395646. The cubic root of 63453521 is about 398.8582461797.

Adding to 63453521 its reverse (12535436), we get a palindrome (75988957).

The spelling of 63453521 in words is "sixty-three million, four hundred fifty-three thousand, five hundred twenty-one".