51731361181 has 2 divisors, whose sum is σ = 51731361182. Its totient is φ = 51731361180.

The previous prime is 51731361169. The next prime is 51731361257. The reversal of 51731361181 is 18116313715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50701528900 + 1029832281 = 225170^2 + 32091^2 .

It is a cyclic number.

It is not a de Polignac number, because 51731361181 - 2¹³ = 51731352989 is a prime.

It is a super-2 number, since 2×51731361181² (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 51731361181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51731361581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25865680590 + 25865680591.

It is an arithmetic number, because the mean of its divisors is an integer number (25865680591).

Almost surely, 2^51731361181 is an apocalyptic number.

It is an amenable number.

51731361181 is a deficient number, since it is larger than the sum of its proper divisors (1).

51731361181 is an equidigital number, since it uses as much as digits as its factorization.

51731361181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 37.

Adding to 51731361181 its reverse (18116313715), we get a palindrome (69847674896).

The spelling of 51731361181 in words is "fifty-one billion, seven hundred thirty-one million, three hundred sixty-one thousand, one hundred eighty-one".