13071127781 has 2 divisors, whose sum is σ = 13071127782. Its totient is φ = 13071127780.

The previous prime is 13071127721. The next prime is 13071127837. The reversal of 13071127781 is 18772117031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12618927556 + 452200225 = 112334^2 + 21265^2 .

It is a cyclic number.

It is not a de Polignac number, because 13071127781 - 2⁶ = 13071127717 is a prime.

It is a super-2 number, since 2×13071127781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13071127721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6535563890 + 6535563891.

It is an arithmetic number, because the mean of its divisors is an integer number (6535563891).

Almost surely, 2^13071127781 is an apocalyptic number.

It is an amenable number.

13071127781 is a deficient number, since it is larger than the sum of its proper divisors (1).

13071127781 is an equidigital number, since it uses as much as digits as its factorization.

13071127781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16464, while the sum is 38.

The spelling of 13071127781 in words is "thirteen billion, seventy-one million, one hundred twenty-seven thousand, seven hundred eighty-one".