52915721 has 2 divisors, whose sum is σ = 52915722. Its totient is φ = 52915720.

The previous prime is 52915699. The next prime is 52915727. The reversal of 52915721 is 12751925.

It is a happy number.

52915721 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., 52722121 + 193600 = 7261^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 52915721 - 2¹⁴ = 52899337 is a prime.

It is not a weakly prime, because it can be changed into another prime (52915727) 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, 26457860 + 26457861.

It is an arithmetic number, because the mean of its divisors is an integer number (26457861).

Almost surely, 2^52915721 is an apocalyptic number.

It is an amenable number.

52915721 is a deficient number, since it is larger than the sum of its proper divisors (1).

52915721 is an equidigital number, since it uses as much as digits as its factorization.

52915721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 32.

The square root of 52915721 is about 7274.3192808675. The cubic root of 52915721 is about 375.4293653852.

The spelling of 52915721 in words is "fifty-two million, nine hundred fifteen thousand, seven hundred twenty-one".