4631563621 has 4 divisors (see below), whose sum is σ = 4695009772. Its totient is φ = 4568117472.

The previous prime is 4631563577. The next prime is 4631563637. The reversal of 4631563621 is 1263651364.

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 1748410596 + 2883153025 = 41814^2 + 53695^2 .

It is a cyclic number.

It is not a de Polignac number, because 4631563621 - 2⁷ = 4631563493 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 (4631543621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31722966 + ... + 31723111.

It is an arithmetic number, because the mean of its divisors is an integer number (1173752443).

Almost surely, 2^4631563621 is an apocalyptic number.

It is an amenable number.

4631563621 is a deficient number, since it is larger than the sum of its proper divisors (63446151).

4631563621 is an equidigital number, since it uses as much as digits as its factorization.

4631563621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63446150.

The product of its digits is 77760, while the sum is 37.

The square root of 4631563621 is about 68055.5921361353. The cubic root of 4631563621 is about 1666.8987133222.

The spelling of 4631563621 in words is "four billion, six hundred thirty-one million, five hundred sixty-three thousand, six hundred twenty-one".