63517561 has 4 divisors (see below), whose sum is σ = 63533952. Its totient is φ = 63501172.

The previous prime is 63517547. The next prime is 63517583. The reversal of 63517561 is 16571536.

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 63517561 - 2⁵ = 63517529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63517591) 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, 1236 + ... + 11338.

It is an arithmetic number, because the mean of its divisors is an integer number (15883488).

Almost surely, 2^63517561 is an apocalyptic number.

It is an amenable number.

63517561 is a deficient number, since it is larger than the sum of its proper divisors (16391).

63517561 is a wasteful number, since it uses less digits than its factorization.

63517561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16390.

The product of its digits is 18900, while the sum is 34.

The square root of 63517561 is about 7969.7905242233. The cubic root of 63517561 is about 398.9923826495.

The spelling of 63517561 in words is "sixty-three million, five hundred seventeen thousand, five hundred sixty-one".