51033821 has 2 divisors, whose sum is σ = 51033822. Its totient is φ = 51033820.

The previous prime is 51033809. The next prime is 51033839. The reversal of 51033821 is 12833015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26925721 + 24108100 = 5189^2 + 4910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51033821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51033721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25516910 + 25516911.

It is an arithmetic number, because the mean of its divisors is an integer number (25516911).

Almost surely, 2^51033821 is an apocalyptic number.

It is an amenable number.

51033821 is a deficient number, since it is larger than the sum of its proper divisors (1).

51033821 is an equidigital number, since it uses as much as digits as its factorization.

51033821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 51033821 is about 7143.7959797295. The cubic root of 51033821 is about 370.9249345008.

Adding to 51033821 its reverse (12833015), we get a palindrome (63866836).

The spelling of 51033821 in words is "fifty-one million, thirty-three thousand, eight hundred twenty-one".