52280821 has 2 divisors, whose sum is σ = 52280822. Its totient is φ = 52280820.

The previous prime is 52280807. The next prime is 52280827. The reversal of 52280821 is 12808225.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52272900 + 7921 = 7230^2 + 89^2 .

It is a cyclic number.

It is not a de Polignac number, because 52280821 - 2¹⁹ = 51756533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 52280821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52280827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26140410 + 26140411.

It is an arithmetic number, because the mean of its divisors is an integer number (26140411).

Almost surely, 2^52280821 is an apocalyptic number.

It is an amenable number.

52280821 is a deficient number, since it is larger than the sum of its proper divisors (1).

52280821 is an equidigital number, since it uses as much as digits as its factorization.

52280821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 52280821 is about 7230.5477662484. The cubic root of 52280821 is about 373.9218120366.

The spelling of 52280821 in words is "fifty-two million, two hundred eighty thousand, eight hundred twenty-one".