5581491569 has 2 divisors, whose sum is σ = 5581491570. Its totient is φ = 5581491568.

The previous prime is 5581491557. The next prime is 5581491571. The reversal of 5581491569 is 9651941855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5032057969 + 549433600 = 70937^2 + 23440^2 .

It is a cyclic number.

It is not a de Polignac number, because 5581491569 - 2²⁰ = 5580442993 is a prime.

It is a super-4 number, since 4×5581491569⁴ (a number of 40 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

Together with 5581491571, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5581491569.

It is not a weakly prime, because it can be changed into another prime (5581491589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2790745784 + 2790745785.

It is an arithmetic number, because the mean of its divisors is an integer number (2790745785).

Almost surely, 2^5581491569 is an apocalyptic number.

It is an amenable number.

5581491569 is a deficient number, since it is larger than the sum of its proper divisors (1).

5581491569 is an equidigital number, since it uses as much as digits as its factorization.

5581491569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944000, while the sum is 53.

The square root of 5581491569 is about 74709.3807295978. The cubic root of 5581491569 is about 1773.8494501329.

The spelling of 5581491569 in words is "five billion, five hundred eighty-one million, four hundred ninety-one thousand, five hundred sixty-nine".