51128086489 has 2 divisors, whose sum is σ = 51128086490. Its totient is φ = 51128086488.

The previous prime is 51128086433. The next prime is 51128086501. The reversal of 51128086489 is 98468082115.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41905365264 + 9222721225 = 204708^2 + 96035^2 .

It is a cyclic number.

It is not a de Polignac number, because 51128086489 - 2²⁵ = 51094532057 is a prime.

It is a super-2 number, since 2×51128086489² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51128081489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25564043244 + 25564043245.

It is an arithmetic number, because the mean of its divisors is an integer number (25564043245).

Almost surely, 2^51128086489 is an apocalyptic number.

It is an amenable number.

51128086489 is a deficient number, since it is larger than the sum of its proper divisors (1).

51128086489 is an equidigital number, since it uses as much as digits as its factorization.

51128086489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1105920, while the sum is 52.

The spelling of 51128086489 in words is "fifty-one billion, one hundred twenty-eight million, eighty-six thousand, four hundred eighty-nine".