63403621 has 2 divisors, whose sum is σ = 63403622. Its totient is φ = 63403620.

The previous prime is 63403619. The next prime is 63403651. The reversal of 63403621 is 12630436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54552996 + 8850625 = 7386^2 + 2975^2 .

It is a cyclic number.

It is not a de Polignac number, because 63403621 - 2¹ = 63403619 is a prime.

Together with 63403619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63403651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31701810 + 31701811.

It is an arithmetic number, because the mean of its divisors is an integer number (31701811).

Almost surely, 2^63403621 is an apocalyptic number.

It is an amenable number.

63403621 is a deficient number, since it is larger than the sum of its proper divisors (1).

63403621 is an equidigital number, since it uses as much as digits as its factorization.

63403621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 63403621 is about 7962.6390725688. The cubic root of 63403621 is about 398.7536644023.

The spelling of 63403621 in words is "sixty-three million, four hundred three thousand, six hundred twenty-one".