5127212757781 has 2 divisors, whose sum is σ = 5127212757782. Its totient is φ = 5127212757780.

The previous prime is 5127212757763. The next prime is 5127212757827. The reversal of 5127212757781 is 1877572127215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5086224730756 + 40988027025 = 2255266^2 + 202455^2 .

It is a cyclic number.

It is not a de Polignac number, because 5127212757781 - 2¹⁵ = 5127212725013 is a prime.

It is a super-2 number, since 2×5127212757781² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5127212757761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2563606378890 + 2563606378891.

It is an arithmetic number, because the mean of its divisors is an integer number (2563606378891).

Almost surely, 2^{5127212757781} is an apocalyptic number.

It is an amenable number.

5127212757781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5127212757781 is an equidigital number, since it uses as much as digits as its factorization.

5127212757781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3841600, while the sum is 55.

The spelling of 5127212757781 in words is "five trillion, one hundred twenty-seven billion, two hundred twelve million, seven hundred fifty-seven thousand, seven hundred eighty-one".