51226561 has 2 divisors, whose sum is σ = 51226562. Its totient is φ = 51226560.

The previous prime is 51226529. The next prime is 51226579. The reversal of 51226561 is 16562215.

51226561 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., 51208336 + 18225 = 7156^2 + 135^2 .

It is a cyclic number.

It is not a de Polignac number, because 51226561 - 2⁵ = 51226529 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51226061) 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, 25613280 + 25613281.

It is an arithmetic number, because the mean of its divisors is an integer number (25613281).

Almost surely, 2^51226561 is an apocalyptic number.

It is an amenable number.

51226561 is a deficient number, since it is larger than the sum of its proper divisors (1).

51226561 is an equidigital number, since it uses as much as digits as its factorization.

51226561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 28.

The square root of 51226561 is about 7157.2732936503. The cubic root of 51226561 is about 371.3913066517.

Adding to 51226561 its reverse (16562215), we get a palindrome (67788776).

The spelling of 51226561 in words is "fifty-one million, two hundred twenty-six thousand, five hundred sixty-one".