5618581 has 2 divisors, whose sum is σ = 5618582. Its totient is φ = 5618580.

The previous prime is 5618579. The next prime is 5618597. The reversal of 5618581 is 1858165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5616900 + 1681 = 2370^2 + 41^2 .

It is a cyclic number.

It is not a de Polignac number, because 5618581 - 2¹ = 5618579 is a prime.

It is a super-2 number, since 2×5618581² = 63136904907122, which contains 22 as substring.

Together with 5618579, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5618881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2809290 + 2809291.

It is an arithmetic number, because the mean of its divisors is an integer number (2809291).

Almost surely, 2^5618581 is an apocalyptic number.

It is an amenable number.

5618581 is a deficient number, since it is larger than the sum of its proper divisors (1).

5618581 is an equidigital number, since it uses as much as digits as its factorization.

5618581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 34.

The square root of 5618581 is about 2370.3546148203. The cubic root of 5618581 is about 177.7769899994.

The spelling of 5618581 in words is "five million, six hundred eighteen thousand, five hundred eighty-one".