5518109621 has 2 divisors, whose sum is σ = 5518109622. Its totient is φ = 5518109620.

The previous prime is 5518109603. The next prime is 5518109627. The reversal of 5518109621 is 1269018155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3076366225 + 2441743396 = 55465^2 + 49414^2 .

It is a cyclic number.

It is not a de Polignac number, because 5518109621 - 2¹⁴ = 5518093237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5518109627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2759054810 + 2759054811.

It is an arithmetic number, because the mean of its divisors is an integer number (2759054811).

Almost surely, 2^5518109621 is an apocalyptic number.

It is an amenable number.

5518109621 is a deficient number, since it is larger than the sum of its proper divisors (1).

5518109621 is an equidigital number, since it uses as much as digits as its factorization.

5518109621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 38.

The square root of 5518109621 is about 74283.9795716412. The cubic root of 5518109621 is about 1767.1094170051.

The spelling of 5518109621 in words is "five billion, five hundred eighteen million, one hundred nine thousand, six hundred twenty-one".