51731443129 has 2 divisors, whose sum is σ = 51731443130. Its totient is φ = 51731443128.

The previous prime is 51731443123. The next prime is 51731443151. The reversal of 51731443129 is 92134413715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47526180025 + 4205263104 = 218005^2 + 64848^2 .

It is a cyclic number.

It is not a de Polignac number, because 51731443129 - 2¹⁷ = 51731312057 is a prime.

It is a super-2 number, since 2×51731443129² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51731443091 and 51731443100.

It is not a weakly prime, because it can be changed into another prime (51731443123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25865721564 + 25865721565.

It is an arithmetic number, because the mean of its divisors is an integer number (25865721565).

Almost surely, 2^51731443129 is an apocalyptic number.

It is an amenable number.

51731443129 is a deficient number, since it is larger than the sum of its proper divisors (1).

51731443129 is an equidigital number, since it uses as much as digits as its factorization.

51731443129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The spelling of 51731443129 in words is "fifty-one billion, seven hundred thirty-one million, four hundred forty-three thousand, one hundred twenty-nine".