5646581 has 2 divisors, whose sum is σ = 5646582. Its totient is φ = 5646580.

The previous prime is 5646577. The next prime is 5646593. The reversal of 5646581 is 1856465.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4774225 + 872356 = 2185^2 + 934^2 .

It is a cyclic number.

It is not a de Polignac number, because 5646581 - 2² = 5646577 is a prime.

It is a super-2 number, since 2×5646581² = 63767753979122, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 9.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5646521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2823290 + 2823291.

It is an arithmetic number, because the mean of its divisors is an integer number (2823291).

Almost surely, 2^5646581 is an apocalyptic number.

It is an amenable number.

5646581 is a deficient number, since it is larger than the sum of its proper divisors (1).

5646581 is an equidigital number, since it uses as much as digits as its factorization.

5646581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 35.

The square root of 5646581 is about 2376.2535639111. The cubic root of 5646581 is about 178.0718159062.

The spelling of 5646581 in words is "five million, six hundred forty-six thousand, five hundred eighty-one".