5518807309 has 2 divisors, whose sum is σ = 5518807310. Its totient is φ = 5518807308.

The previous prime is 5518807303. The next prime is 5518807331. The reversal of 5518807309 is 9037088155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3916006084 + 1602801225 = 62578^2 + 40035^2 .

It is a cyclic number.

It is not a de Polignac number, because 5518807309 - 2¹⁹ = 5518283021 is a prime.

It is a super-2 number, since 2×5518807309² = 60914468227743642962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5518807303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2759403654 + 2759403655.

It is an arithmetic number, because the mean of its divisors is an integer number (2759403655).

Almost surely, 2^5518807309 is an apocalyptic number.

It is an amenable number.

5518807309 is a deficient number, since it is larger than the sum of its proper divisors (1).

5518807309 is an equidigital number, since it uses as much as digits as its factorization.

5518807309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 46.

The square root of 5518807309 is about 74288.6755097976. The cubic root of 5518807309 is about 1767.1838893131.

The spelling of 5518807309 in words is "five billion, five hundred eighteen million, eight hundred seven thousand, three hundred nine".