63457521 has 4 divisors (see below), whose sum is σ = 84610032. Its totient is φ = 42305012.

The previous prime is 63457519. The next prime is 63457547. The reversal of 63457521 is 12575436.

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 63457521 - 2¹ = 63457519 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63457571) 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, 10576251 + ... + 10576256.

It is an arithmetic number, because the mean of its divisors is an integer number (21152508).

Almost surely, 2^63457521 is an apocalyptic number.

It is an amenable number.

63457521 is a deficient number, since it is larger than the sum of its proper divisors (21152511).

63457521 is a wasteful number, since it uses less digits than its factorization.

63457521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21152510.

The product of its digits is 25200, while the sum is 33.

The square root of 63457521 is about 7966.0229098340. The cubic root of 63457521 is about 398.8666271145.

The spelling of 63457521 in words is "sixty-three million, four hundred fifty-seven thousand, five hundred twenty-one".