51017521 has 2 divisors, whose sum is σ = 51017522. Its totient is φ = 51017520.

The previous prime is 51017509. The next prime is 51017539. The reversal of 51017521 is 12571015.

51017521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42250000 + 8767521 = 6500^2 + 2961^2 .

It is a cyclic number.

It is not a de Polignac number, because 51017521 - 2⁹ = 51017009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51017492 and 51017501.

It is not a weakly prime, because it can be changed into another prime (51017501) 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, 25508760 + 25508761.

It is an arithmetic number, because the mean of its divisors is an integer number (25508761).

Almost surely, 2^51017521 is an apocalyptic number.

It is an amenable number.

51017521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51017521 is an equidigital number, since it uses as much as digits as its factorization.

51017521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 51017521 is about 7142.6550385693. The cubic root of 51017521 is about 370.8854396447.

Adding to 51017521 its reverse (12571015), we get a palindrome (63588536).

The spelling of 51017521 in words is "fifty-one million, seventeen thousand, five hundred twenty-one".