63192721 has 2 divisors, whose sum is σ = 63192722. Its totient is φ = 63192720.

The previous prime is 63192719. The next prime is 63192737. The reversal of 63192721 is 12729136.

63192721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63123025 + 69696 = 7945^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 63192721 - 2¹ = 63192719 is a prime.

Together with 63192719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (63192751) 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, 31596360 + 31596361.

It is an arithmetic number, because the mean of its divisors is an integer number (31596361).

Almost surely, 2^63192721 is an apocalyptic number.

It is an amenable number.

63192721 is a deficient number, since it is larger than the sum of its proper divisors (1).

63192721 is an equidigital number, since it uses as much as digits as its factorization.

63192721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 63192721 is about 7949.3849447614. The cubic root of 63192721 is about 398.3110473848.

The spelling of 63192721 in words is "sixty-three million, one hundred ninety-two thousand, seven hundred twenty-one".