52252721 has 2 divisors, whose sum is σ = 52252722. Its totient is φ = 52252720.

The previous prime is 52252703. The next prime is 52252723. The reversal of 52252721 is 12725225.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42393121 + 9859600 = 6511^2 + 3140^2 .

It is a cyclic number.

It is not a de Polignac number, because 52252721 - 2⁶ = 52252657 is a prime.

Together with 52252723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (52252723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26126360 + 26126361.

It is an arithmetic number, because the mean of its divisors is an integer number (26126361).

Almost surely, 2^52252721 is an apocalyptic number.

It is an amenable number.

52252721 is a deficient number, since it is larger than the sum of its proper divisors (1).

52252721 is an equidigital number, since it uses as much as digits as its factorization.

52252721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2800, while the sum is 26.

The square root of 52252721 is about 7228.6043604558. The cubic root of 52252721 is about 373.8548079501.

Adding to 52252721 its reverse (12725225), we get a palindrome (64977946).

The spelling of 52252721 in words is "fifty-two million, two hundred fifty-two thousand, seven hundred twenty-one".