5081821 has 2 divisors, whose sum is σ = 5081822. Its totient is φ = 5081820.

The previous prime is 5081819. The next prime is 5081837. The reversal of 5081821 is 1281805.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5062500 + 19321 = 2250^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 5081821 - 2¹ = 5081819 is a prime.

Together with 5081819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5081801) 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, 2540910 + 2540911.

It is an arithmetic number, because the mean of its divisors is an integer number (2540911).

Almost surely, 2^5081821 is an apocalyptic number.

It is an amenable number.

5081821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5081821 is an equidigital number, since it uses as much as digits as its factorization.

5081821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 5081821 is about 2254.2894667722. The cubic root of 5081821 is about 171.9252988214.

The spelling of 5081821 in words is "five million, eighty-one thousand, eight hundred twenty-one".