5647561 has 2 divisors, whose sum is σ = 5647562. Its totient is φ = 5647560.

The previous prime is 5647559. The next prime is 5647571. The reversal of 5647561 is 1657465.

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., 4161600 + 1485961 = 2040^2 + 1219^2 .

It is a cyclic number.

It is not a de Polignac number, because 5647561 - 2¹ = 5647559 is a prime.

Together with 5647559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (5647501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2823780 + 2823781.

It is an arithmetic number, because the mean of its divisors is an integer number (2823781).

Almost surely, 2^5647561 is an apocalyptic number.

It is an amenable number.

5647561 is a deficient number, since it is larger than the sum of its proper divisors (1).

5647561 is an equidigital number, since it uses as much as digits as its factorization.

5647561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 5647561 is about 2376.4597619148. The cubic root of 5647561 is about 178.0821171418.

The spelling of 5647561 in words is "five million, six hundred forty-seven thousand, five hundred sixty-one".