121559 has 2 divisors, whose sum is σ = 121560. Its totient is φ = 121558.

The previous prime is 121553. The next prime is 121571. The reversal of 121559 is 955121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121559 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60779 + 60780.

It is an arithmetic number, because the mean of its divisors is an integer number (60780).

2¹²¹⁵⁵⁹ is an apocalyptic number.

121559 is a deficient number, since it is larger than the sum of its proper divisors (1).

121559 is an equidigital number, since it uses as much as digits as its factorization.

121559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 450, while the sum is 23.

The square root of 121559 is about 348.6531227452. The cubic root of 121559 is about 49.5369244611.

The spelling of 121559 in words is "one hundred twenty-one thousand, five hundred fifty-nine".