421559993 has 2 divisors, whose sum is σ = 421559994. Its totient is φ = 421559992.

The previous prime is 421559987. The next prime is 421560017. The reversal of 421559993 is 399955124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 372181264 + 49378729 = 19292^2 + 7027^2 .

It is a cyclic number.

It is not a de Polignac number, because 421559993 - 2⁴ = 421559977 is a prime.

It is not a weakly prime, because it can be changed into another prime (421559923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210779996 + 210779997.

It is an arithmetic number, because the mean of its divisors is an integer number (210779997).

Almost surely, 2^421559993 is an apocalyptic number.

It is an amenable number.

421559993 is a deficient number, since it is larger than the sum of its proper divisors (1).

421559993 is an equidigital number, since it uses as much as digits as its factorization.

421559993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 437400, while the sum is 47.

The square root of 421559993 is about 20531.9261882562. The cubic root of 421559993 is about 749.8132827046.

The spelling of 421559993 in words is "four hundred twenty-one million, five hundred fifty-nine thousand, nine hundred ninety-three".