121663559 has 2 divisors, whose sum is σ = 121663560. Its totient is φ = 121663558.

The previous prime is 121663547. The next prime is 121663571. The reversal of 121663559 is 955366121.

121663559 is nontrivially palindromic in base 16.

It is a balanced prime because it is at equal distance from previous prime (121663547) and next prime (121663571).

It is a cyclic number.

It is not a de Polignac number, because 121663559 - 2²⁴ = 104886343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121663159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60831779 + 60831780.

It is an arithmetic number, because the mean of its divisors is an integer number (60831780).

Almost surely, 2^121663559 is an apocalyptic number.

121663559 is a deficient number, since it is larger than the sum of its proper divisors (1).

121663559 is an equidigital number, since it uses as much as digits as its factorization.

121663559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 38.

The square root of 121663559 is about 11030.1205342462. The cubic root of 121663559 is about 495.5112345620.

The spelling of 121663559 in words is "one hundred twenty-one million, six hundred sixty-three thousand, five hundred fifty-nine".