52643821 has 2 divisors, whose sum is σ = 52643822. Its totient is φ = 52643820.

The previous prime is 52643819. The next prime is 52643837. The reversal of 52643821 is 12834625.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40182921 + 12460900 = 6339^2 + 3530^2 .

It is a cyclic number.

It is not a de Polignac number, because 52643821 - 2¹ = 52643819 is a prime.

Together with 52643819, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52643881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26321910 + 26321911.

It is an arithmetic number, because the mean of its divisors is an integer number (26321911).

Almost surely, 2^52643821 is an apocalyptic number.

It is an amenable number.

52643821 is a deficient number, since it is larger than the sum of its proper divisors (1).

52643821 is an equidigital number, since it uses as much as digits as its factorization.

52643821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 31.

The square root of 52643821 is about 7255.6061772949. The cubic root of 52643821 is about 374.7852305025.

The spelling of 52643821 in words is "fifty-two million, six hundred forty-three thousand, eight hundred twenty-one".