63600721 has 2 divisors, whose sum is σ = 63600722. Its totient is φ = 63600720.

The previous prime is 63600679. The next prime is 63600731. The reversal of 63600721 is 12700636.

63600721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63361600 + 239121 = 7960^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 63600721 - 2⁹ = 63600209 is a prime.

It is not a weakly prime, because it can be changed into another prime (63600731) 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, 31800360 + 31800361.

It is an arithmetic number, because the mean of its divisors is an integer number (31800361).

Almost surely, 2^63600721 is an apocalyptic number.

It is an amenable number.

63600721 is a deficient number, since it is larger than the sum of its proper divisors (1).

63600721 is an equidigital number, since it uses as much as digits as its factorization.

63600721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 63600721 is about 7975.0060188065. The cubic root of 63600721 is about 399.1664328713.

The spelling of 63600721 in words is "sixty-three million, six hundred thousand, seven hundred twenty-one".