19559 has 2 divisors, whose sum is σ = 19560. Its totient is φ = 19558.

The previous prime is 19553. The next prime is 19571. The reversal of 19559 is 95591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19559 - 2⁴ = 19543 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9779 + 9780.

It is an arithmetic number, because the mean of its divisors is an integer number (9780).

2¹⁹⁵⁵⁹ is an apocalyptic number.

19559 is a deficient number, since it is larger than the sum of its proper divisors (1).

19559 is an equidigital number, since it uses as much as digits as its factorization.

19559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2025, while the sum is 29.

The square root of 19559 is about 139.8534947722. The cubic root of 19559 is about 26.9431818431.

The spelling of 19559 in words is "nineteen thousand, five hundred fifty-nine".