5256821 has 2 divisors, whose sum is σ = 5256822. Its totient is φ = 5256820.

The previous prime is 5256817. The next prime is 5256829. The reversal of 5256821 is 1286525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3783025 + 1473796 = 1945^2 + 1214^2 .

It is a cyclic number.

It is not a de Polignac number, because 5256821 - 2² = 5256817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5256829) 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, 2628410 + 2628411.

It is an arithmetic number, because the mean of its divisors is an integer number (2628411).

Almost surely, 2^5256821 is an apocalyptic number.

It is an amenable number.

5256821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5256821 is an equidigital number, since it uses as much as digits as its factorization.

5256821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 29.

The square root of 5256821 is about 2292.7758285537. The cubic root of 5256821 is about 173.8765694407.

The spelling of 5256821 in words is "five million, two hundred fifty-six thousand, eight hundred twenty-one".