51288521 has 2 divisors, whose sum is σ = 51288522. Its totient is φ = 51288520.

The previous prime is 51288487. The next prime is 51288527. The reversal of 51288521 is 12588215.

It is a happy number.

51288521 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., 50922496 + 366025 = 7136^2 + 605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51288521 is a prime.

It is not a weakly prime, because it can be changed into another prime (51288527) 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, 25644260 + 25644261.

It is an arithmetic number, because the mean of its divisors is an integer number (25644261).

Almost surely, 2^51288521 is an apocalyptic number.

It is an amenable number.

51288521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51288521 is an equidigital number, since it uses as much as digits as its factorization.

51288521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6400, while the sum is 32.

The square root of 51288521 is about 7161.6004496202. The cubic root of 51288521 is about 371.5409824806.

The spelling of 51288521 in words is "fifty-one million, two hundred eighty-eight thousand, five hundred twenty-one".