51040430081 has 2 divisors, whose sum is σ = 51040430082. Its totient is φ = 51040430080.

The previous prime is 51040430053. The next prime is 51040430149. The reversal of 51040430081 is 18003404015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50437973056 + 602457025 = 224584^2 + 24545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51040430081 is a prime.

It is a super-2 number, since 2×51040430081² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51040430081.

It is not a weakly prime, because it can be changed into another prime (51040430281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25520215040 + 25520215041.

It is an arithmetic number, because the mean of its divisors is an integer number (25520215041).

Almost surely, 2^51040430081 is an apocalyptic number.

It is an amenable number.

51040430081 is a deficient number, since it is larger than the sum of its proper divisors (1).

51040430081 is an equidigital number, since it uses as much as digits as its factorization.

51040430081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 51040430081 its reverse (18003404015), we get a palindrome (69043834096).

The spelling of 51040430081 in words is "fifty-one billion, forty million, four hundred thirty thousand, eighty-one".