51281358881 has 2 divisors, whose sum is σ = 51281358882. Its totient is φ = 51281358880.

The previous prime is 51281358803. The next prime is 51281358893. The reversal of 51281358881 is 18885318215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45535718881 + 5745640000 = 213391^2 + 75800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51281358881 is a prime.

It is a super-2 number, since 2×51281358881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51281358181) 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, 25640679440 + 25640679441.

It is an arithmetic number, because the mean of its divisors is an integer number (25640679441).

Almost surely, 2^51281358881 is an apocalyptic number.

It is an amenable number.

51281358881 is a deficient number, since it is larger than the sum of its proper divisors (1).

51281358881 is an equidigital number, since it uses as much as digits as its factorization.

51281358881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 614400, while the sum is 50.

The spelling of 51281358881 in words is "fifty-one billion, two hundred eighty-one million, three hundred fifty-eight thousand, eight hundred eighty-one".