63711521 has 8 divisors (see below), whose sum is σ = 67690920. Its totient is φ = 59851008.

The previous prime is 63711497. The next prime is 63711523. The reversal of 63711521 is 12511736.

It can be written as a sum of positive squares in 4 ways, for example, as 37650496 + 26061025 = 6136^2 + 5105^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 63711521 - 2¹⁸ = 63449377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63711523) 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 7 ways as a sum of consecutive naturals, for example, 28616 + ... + 30761.

It is an arithmetic number, because the mean of its divisors is an integer number (8461365).

Almost surely, 2^63711521 is an apocalyptic number.

It is an amenable number.

63711521 is a deficient number, since it is larger than the sum of its proper divisors (3979399).

63711521 is a wasteful number, since it uses less digits than its factorization.

63711521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59443.

The product of its digits is 1260, while the sum is 26.

The square root of 63711521 is about 7981.9496991650. The cubic root of 63711521 is about 399.3980968190.

The spelling of 63711521 in words is "sixty-three million, seven hundred eleven thousand, five hundred twenty-one".