63372721 has 2 divisors, whose sum is σ = 63372722. Its totient is φ = 63372720.

The previous prime is 63372689. The next prime is 63372739. The reversal of 63372721 is 12727336.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52056225 + 11316496 = 7215^2 + 3364^2 .

It is a cyclic number.

It is not a de Polignac number, because 63372721 - 2⁵ = 63372689 is a prime.

It is a super-2 number, since 2×63372721² = 8032203533887682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63372761) 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, 31686360 + 31686361.

It is an arithmetic number, because the mean of its divisors is an integer number (31686361).

Almost surely, 2^63372721 is an apocalyptic number.

It is an amenable number.

63372721 is a deficient number, since it is larger than the sum of its proper divisors (1).

63372721 is an equidigital number, since it uses as much as digits as its factorization.

63372721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 31.

The square root of 63372721 is about 7960.6985246271. The cubic root of 63372721 is about 398.6888758291.

The spelling of 63372721 in words is "sixty-three million, three hundred seventy-two thousand, seven hundred twenty-one".