63715321 has 2 divisors, whose sum is σ = 63715322. Its totient is φ = 63715320.

The previous prime is 63715319. The next prime is 63715331. The reversal of 63715321 is 12351736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41990400 + 21724921 = 6480^2 + 4661^2 .

It is a cyclic number.

It is not a de Polignac number, because 63715321 - 2¹ = 63715319 is a prime.

Together with 63715319, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 63715321.

It is not a weakly prime, because it can be changed into another prime (63715331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31857660 + 31857661.

It is an arithmetic number, because the mean of its divisors is an integer number (31857661).

Almost surely, 2^63715321 is an apocalyptic number.

It is an amenable number.

63715321 is a deficient number, since it is larger than the sum of its proper divisors (1).

63715321 is an equidigital number, since it uses as much as digits as its factorization.

63715321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 28.

The square root of 63715321 is about 7982.1877326958. The cubic root of 63715321 is about 399.4060372071.

The spelling of 63715321 in words is "sixty-three million, seven hundred fifteen thousand, three hundred twenty-one".