51256553 has 2 divisors, whose sum is σ = 51256554. Its totient is φ = 51256552.

The previous prime is 51256549. The next prime is 51256571. The reversal of 51256553 is 35565215.

51256553 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., 46403344 + 4853209 = 6812^2 + 2203^2 .

It is a cyclic number.

It is not a de Polignac number, because 51256553 - 2² = 51256549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51256453) 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, 25628276 + 25628277.

It is an arithmetic number, because the mean of its divisors is an integer number (25628277).

Almost surely, 2^51256553 is an apocalyptic number.

It is an amenable number.

51256553 is a deficient number, since it is larger than the sum of its proper divisors (1).

51256553 is an equidigital number, since it uses as much as digits as its factorization.

51256553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22500, while the sum is 32.

The square root of 51256553 is about 7159.3681983818. The cubic root of 51256553 is about 371.4637729317.

The spelling of 51256553 in words is "fifty-one million, two hundred fifty-six thousand, five hundred fifty-three".