51288237802181 has 2 divisors, whose sum is σ = 51288237802182. Its totient is φ = 51288237802180.

The previous prime is 51288237802163. The next prime is 51288237802231. The reversal of 51288237802181 is 18120873288215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40126016940100 + 11162220862081 = 6334510^2 + 3340991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51288237802181 is a prime.

It is a super-2 number, since 2×51288237802181² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51288237802111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25644118901090 + 25644118901091.

It is an arithmetic number, because the mean of its divisors is an integer number (25644118901091).

Almost surely, 2^{51288237802181} is an apocalyptic number.

It is an amenable number.

51288237802181 is a deficient number, since it is larger than the sum of its proper divisors (1).

51288237802181 is an equidigital number, since it uses as much as digits as its factorization.

51288237802181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3440640, while the sum is 56.

The spelling of 51288237802181 in words is "fifty-one trillion, two hundred eighty-eight billion, two hundred thirty-seven million, eight hundred two thousand, one hundred eighty-one".