421559 has 2 divisors, whose sum is σ = 421560. Its totient is φ = 421558.

The previous prime is 421517. The next prime is 421607. The reversal of 421559 is 955124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421559 - 2⁸ = 421303 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210779 + 210780.

It is an arithmetic number, because the mean of its divisors is an integer number (210780).

2⁴²¹⁵⁵⁹ is an apocalyptic number.

421559 is a deficient number, since it is larger than the sum of its proper divisors (1).

421559 is an equidigital number, since it uses as much as digits as its factorization.

421559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 421559 is about 649.2757503557. The cubic root of 421559 is about 74.9812693967.

The spelling of 421559 in words is "four hundred twenty-one thousand, five hundred fifty-nine".