123421559 has 2 divisors, whose sum is σ = 123421560. Its totient is φ = 123421558.

The previous prime is 123421553. The next prime is 123421601. The reversal of 123421559 is 955124321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123421559 - 2²⁰ = 122372983 is a prime.

It is a Sophie Germain 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 (123421553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61710779 + 61710780.

It is an arithmetic number, because the mean of its divisors is an integer number (61710780).

Almost surely, 2^123421559 is an apocalyptic number.

123421559 is a deficient number, since it is larger than the sum of its proper divisors (1).

123421559 is an equidigital number, since it uses as much as digits as its factorization.

123421559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 32.

The square root of 123421559 is about 11109.5255974321. The cubic root of 123421559 is about 497.8864907451.

The spelling of 123421559 in words is "one hundred twenty-three million, four hundred twenty-one thousand, five hundred fifty-nine".