5561639 has 2 divisors, whose sum is σ = 5561640. Its totient is φ = 5561638.

The previous prime is 5561629. The next prime is 5561641. The reversal of 5561639 is 9361655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5561639 - 2⁸ = 5561383 is a prime.

Together with 5561641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 5561599 and 5561608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5561629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2780819 + 2780820.

It is an arithmetic number, because the mean of its divisors is an integer number (2780820).

Almost surely, 2^5561639 is an apocalyptic number.

5561639 is a deficient number, since it is larger than the sum of its proper divisors (1).

5561639 is an equidigital number, since it uses as much as digits as its factorization.

5561639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 35.

The square root of 5561639 is about 2358.3127443153. The cubic root of 5561639 is about 177.1743841922.

It can be divided in two parts, 55616 and 39, that added together give a palindrome (55655).

The spelling of 5561639 in words is "five million, five hundred sixty-one thousand, six hundred thirty-nine".