421751563 has 2 divisors, whose sum is σ = 421751564. Its totient is φ = 421751562.

The previous prime is 421751549. The next prime is 421751597. The reversal of 421751563 is 365157124.

It is an a-pointer prime, because the next prime (421751597) can be obtained adding 421751563 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421751563 is a prime.

It is not a weakly prime, because it can be changed into another prime (421752563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210875781 + 210875782.

It is an arithmetic number, because the mean of its divisors is an integer number (210875782).

Almost surely, 2^421751563 is an apocalyptic number.

421751563 is a deficient number, since it is larger than the sum of its proper divisors (1).

421751563 is an equidigital number, since it uses as much as digits as its factorization.

421751563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 34.

The square root of 421751563 is about 20536.5908319760. The cubic root of 421751563 is about 749.9268450128.

The spelling of 421751563 in words is "four hundred twenty-one million, seven hundred fifty-one thousand, five hundred sixty-three".