5516561 has 2 divisors, whose sum is σ = 5516562. Its totient is φ = 5516560.

The previous prime is 5516549. The next prime is 5516587. The reversal of 5516561 is 1656155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5202961 + 313600 = 2281^2 + 560^2 .

It is a cyclic number.

It is not a de Polignac number, because 5516561 - 2²² = 1322257 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5516501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2758280 + 2758281.

It is an arithmetic number, because the mean of its divisors is an integer number (2758281).

Almost surely, 2^5516561 is an apocalyptic number.

It is an amenable number.

5516561 is a deficient number, since it is larger than the sum of its proper divisors (1).

5516561 is an equidigital number, since it uses as much as digits as its factorization.

5516561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4500, while the sum is 29.

The square root of 5516561 is about 2348.7360430666. The cubic root of 5516561 is about 176.6944092345.

The spelling of 5516561 in words is "five million, five hundred sixteen thousand, five hundred sixty-one".