423521563 has 4 divisors (see below), whose sum is σ = 441935568. Its totient is φ = 405107560.

The previous prime is 423521557. The next prime is 423521599. The reversal of 423521563 is 365125324.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423521563 is a prime.

It is a super-3 number, since 3×423521563³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (423521863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9206968 + ... + 9207013.

It is an arithmetic number, because the mean of its divisors is an integer number (110483892).

Almost surely, 2^423521563 is an apocalyptic number.

423521563 is a deficient number, since it is larger than the sum of its proper divisors (18414005).

423521563 is a wasteful number, since it uses less digits than its factorization.

423521563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18414004.

The product of its digits is 21600, while the sum is 31.

The square root of 423521563 is about 20579.6395255116. The cubic root of 423521563 is about 750.9744743550.

Adding to 423521563 its reverse (365125324), we get a palindrome (788646887).

The spelling of 423521563 in words is "four hundred twenty-three million, five hundred twenty-one thousand, five hundred sixty-three".