5605681 has 2 divisors, whose sum is σ = 5605682. Its totient is φ = 5605680.

The previous prime is 5605679. The next prime is 5605687. The reversal of 5605681 is 1865065.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4165681 + 1440000 = 2041^2 + 1200^2 .

It is a cyclic number.

It is not a de Polignac number, because 5605681 - 2¹ = 5605679 is a prime.

It is a super-2 number, since 2×5605681² = 62847318947522, which contains 22 as substring.

Together with 5605679, it forms a pair of twin primes.

It is a Chen prime.

5605681 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (5605687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2802840 + 2802841.

It is an arithmetic number, because the mean of its divisors is an integer number (2802841).

Almost surely, 2^5605681 is an apocalyptic number.

It is an amenable number.

5605681 is a deficient number, since it is larger than the sum of its proper divisors (1).

5605681 is an equidigital number, since it uses as much as digits as its factorization.

5605681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 5605681 is about 2367.6319393014. The cubic root of 5605681 is about 177.6408298471.

It can be divided in two parts, 560 and 5681, that added together give a square (6241 = 79²).

The spelling of 5605681 in words is "five million, six hundred five thousand, six hundred eighty-one".