51042521 has 2 divisors, whose sum is σ = 51042522. Its totient is φ = 51042520.

The previous prime is 51042491. The next prime is 51042527. The reversal of 51042521 is 12524015.

51042521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42719296 + 8323225 = 6536^2 + 2885^2 .

It is a cyclic number.

It is not a de Polignac number, because 51042521 - 2⁶ = 51042457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51042493 and 51042502.

It is not a weakly prime, because it can be changed into another prime (51042527) 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, 25521260 + 25521261.

It is an arithmetic number, because the mean of its divisors is an integer number (25521261).

Almost surely, 2^51042521 is an apocalyptic number.

It is an amenable number.

51042521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51042521 is an equidigital number, since it uses as much as digits as its factorization.

51042521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 51042521 is about 7144.4048737456. The cubic root of 51042521 is about 370.9460111352.

Adding to 51042521 its reverse (12524015), we get a palindrome (63566536).

The spelling of 51042521 in words is "fifty-one million, forty-two thousand, five hundred twenty-one".