55609 has 2 divisors, whose sum is σ = 55610. Its totient is φ = 55608.

The previous prime is 55603. The next prime is 55619. The reversal of 55609 is 90655.

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., 41209 + 14400 = 203^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 55609 - 2¹³ = 47417 is a prime.

55609 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (55603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27804 + 27805.

It is an arithmetic number, because the mean of its divisors is an integer number (27805).

2⁵⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

55609 is a deficient number, since it is larger than the sum of its proper divisors (1).

55609 is an equidigital number, since it uses as much as digits as its factorization.

55609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 55609 is about 235.8156059297. The cubic root of 55609 is about 38.1693732203.

The spelling of 55609 in words is "fifty-five thousand, six hundred nine".