421568893 has 2 divisors, whose sum is σ = 421568894. Its totient is φ = 421568892.

The previous prime is 421568867. The next prime is 421568899. The reversal of 421568893 is 398865124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 407151684 + 14417209 = 20178^2 + 3797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421568893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421568899) 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, 210784446 + 210784447.

It is an arithmetic number, because the mean of its divisors is an integer number (210784447).

Almost surely, 2^421568893 is an apocalyptic number.

It is an amenable number.

421568893 is a deficient number, since it is larger than the sum of its proper divisors (1).

421568893 is an equidigital number, since it uses as much as digits as its factorization.

421568893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 46.

The square root of 421568893 is about 20532.1429227443. The cubic root of 421568893 is about 749.8185593685.

The spelling of 421568893 in words is "four hundred twenty-one million, five hundred sixty-eight thousand, eight hundred ninety-three".