421563647 has 2 divisors, whose sum is σ = 421563648. Its totient is φ = 421563646.

The previous prime is 421563631. The next prime is 421563677. The reversal of 421563647 is 746365124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421563647 - 2⁴ = 421563631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421563647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421563617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210781823 + 210781824.

It is an arithmetic number, because the mean of its divisors is an integer number (210781824).

Almost surely, 2^421563647 is an apocalyptic number.

421563647 is a deficient number, since it is larger than the sum of its proper divisors (1).

421563647 is an equidigital number, since it uses as much as digits as its factorization.

421563647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 38.

The square root of 421563647 is about 20532.0151714341. The cubic root of 421563647 is about 749.8154491102.

The spelling of 421563647 in words is "four hundred twenty-one million, five hundred sixty-three thousand, six hundred forty-seven".