5581493581 has 2 divisors, whose sum is σ = 5581493582. Its totient is φ = 5581493580.

The previous prime is 5581493501. The next prime is 5581493629. The reversal of 5581493581 is 1853941855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5146771081 + 434722500 = 71741^2 + 20850^2 .

It is a cyclic number.

It is not a de Polignac number, because 5581493581 - 2⁷ = 5581493453 is a prime.

It is a super-2 number, since 2×5581493581² = 62306141189488407122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5581493501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2790746790 + 2790746791.

It is an arithmetic number, because the mean of its divisors is an integer number (2790746791).

Almost surely, 2^5581493581 is an apocalyptic number.

It is an amenable number.

5581493581 is a deficient number, since it is larger than the sum of its proper divisors (1).

5581493581 is an equidigital number, since it uses as much as digits as its factorization.

5581493581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864000, while the sum is 49.

The square root of 5581493581 is about 74709.3941951078. The cubic root of 5581493581 is about 1773.8496632769.

The spelling of 5581493581 in words is "five billion, five hundred eighty-one million, four hundred ninety-three thousand, five hundred eighty-one".