563640321 has 16 divisors (see below), whose sum is σ = 798842304. Its totient is φ = 352272384.

The previous prime is 563640313. The next prime is 563640347. The reversal of 563640321 is 123046365.

It is not a de Polignac number, because 563640321 - 2³ = 563640313 is a prime.

It is a super-2 number, since 2×563640321² = 635380822913966082, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (563640361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8395 + ... + 34608.

It is an arithmetic number, because the mean of its divisors is an integer number (49927644).

Almost surely, 2^563640321 is an apocalyptic number.

563640321 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

563640321 is a deficient number, since it is larger than the sum of its proper divisors (235201983).

563640321 is a wasteful number, since it uses less digits than its factorization.

563640321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43280.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 563640321 is about 23741.1103573527. The cubic root of 563640321 is about 826.0392515551.

Adding to 563640321 its reverse (123046365), we get a palindrome (686686686).

The spelling of 563640321 in words is "five hundred sixty-three million, six hundred forty thousand, three hundred twenty-one".