63520561 has 4 divisors (see below), whose sum is σ = 68406772. Its totient is φ = 58634352.

The previous prime is 63520559. The next prime is 63520573. The reversal of 63520561 is 16502536.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4906225 + 58614336 = 2215^2 + 7656^2 .

It is a cyclic number.

It is not a de Polignac number, because 63520561 - 2¹ = 63520559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63520531) 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, 2443086 + ... + 2443111.

It is an arithmetic number, because the mean of its divisors is an integer number (17101693).

Almost surely, 2^63520561 is an apocalyptic number.

It is an amenable number.

63520561 is a deficient number, since it is larger than the sum of its proper divisors (4886211).

63520561 is a wasteful number, since it uses less digits than its factorization.

63520561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4886210.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 63520561 is about 7969.9787327194. The cubic root of 63520561 is about 398.9986641580.

The spelling of 63520561 in words is "sixty-three million, five hundred twenty thousand, five hundred sixty-one".