51025511521 has 2 divisors, whose sum is σ = 51025511522. Its totient is φ = 51025511520.

The previous prime is 51025511491. The next prime is 51025511539. The reversal of 51025511521 is 12511552015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31875103296 + 19150408225 = 178536^2 + 138385^2 .

It is a cyclic number.

It is not a de Polignac number, because 51025511521 - 2¹¹ = 51025509473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51025511521.

It is not a weakly prime, because it can be changed into another prime (51025511021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25512755760 + 25512755761.

It is an arithmetic number, because the mean of its divisors is an integer number (25512755761).

Almost surely, 2^51025511521 is an apocalyptic number.

It is an amenable number.

51025511521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51025511521 is an equidigital number, since it uses as much as digits as its factorization.

51025511521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2500, while the sum is 28.

The spelling of 51025511521 in words is "fifty-one billion, twenty-five million, five hundred eleven thousand, five hundred twenty-one".