563634721 has 4 divisors (see below), whose sum is σ = 606991252. Its totient is φ = 520278192.

The previous prime is 563634719. The next prime is 563634733. The reversal of 563634721 is 127436365.

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 264517696 + 299117025 = 16264^2 + 17295^2 .

It is a cyclic number.

It is not a de Polignac number, because 563634721 - 2¹ = 563634719 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (563634761) 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, 21678246 + ... + 21678271.

It is an arithmetic number, because the mean of its divisors is an integer number (151747813).

Almost surely, 2^563634721 is an apocalyptic number.

It is an amenable number.

563634721 is a deficient number, since it is larger than the sum of its proper divisors (43356531).

563634721 is a wasteful number, since it uses less digits than its factorization.

563634721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43356530.

The product of its digits is 90720, while the sum is 37.

The square root of 563634721 is about 23740.9924181783. The cubic root of 563634721 is about 826.0365158654.

The spelling of 563634721 in words is "five hundred sixty-three million, six hundred thirty-four thousand, seven hundred twenty-one".