63561071 has 4 divisors (see below), whose sum is σ = 72641232. Its totient is φ = 54480912.

The previous prime is 63561059. The next prime is 63561073. The reversal of 63561071 is 17016536.

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

It is a cyclic number.

It is not a de Polignac number, because 63561071 - 2¹⁰ = 63560047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63561073) 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, 4540070 + ... + 4540083.

It is an arithmetic number, because the mean of its divisors is an integer number (18160308).

Almost surely, 2^63561071 is an apocalyptic number.

63561071 is a deficient number, since it is larger than the sum of its proper divisors (9080161).

63561071 is an equidigital number, since it uses as much as digits as its factorization.

63561071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9080160.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 63561071 is about 7972.5197397059. The cubic root of 63561071 is about 399.0834661014.

The spelling of 63561071 in words is "sixty-three million, five hundred sixty-one thousand, seventy-one".