51446039581 has 2 divisors, whose sum is σ = 51446039582. Its totient is φ = 51446039580.

The previous prime is 51446039509. The next prime is 51446039647. The reversal of 51446039581 is 18593064415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28246180356 + 23199859225 = 168066^2 + 152315^2 .

It is a cyclic number.

It is not a de Polignac number, because 51446039581 - 2⁹ = 51446039069 is a prime.

It is a super-2 number, since 2×51446039581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51446039501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25723019790 + 25723019791.

It is an arithmetic number, because the mean of its divisors is an integer number (25723019791).

Almost surely, 2^51446039581 is an apocalyptic number.

It is an amenable number.

51446039581 is a deficient number, since it is larger than the sum of its proper divisors (1).

51446039581 is an equidigital number, since it uses as much as digits as its factorization.

51446039581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 51446039581 in words is "fifty-one billion, four hundred forty-six million, thirty-nine thousand, five hundred eighty-one".