12739097981 has 2 divisors, whose sum is σ = 12739097982. Its totient is φ = 12739097980.

The previous prime is 12739097971. The next prime is 12739098007. The reversal of 12739097981 is 18979093721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10918369081 + 1820728900 = 104491^2 + 42670^2 .

It is a cyclic number.

It is not a de Polignac number, because 12739097981 - 2²⁶ = 12671989117 is a prime.

It is a super-2 number, since 2×12739097981² (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 (12739097911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6369548990 + 6369548991.

It is an arithmetic number, because the mean of its divisors is an integer number (6369548991).

Almost surely, 2^12739097981 is an apocalyptic number.

It is an amenable number.

12739097981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12739097981 is an equidigital number, since it uses as much as digits as its factorization.

12739097981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1714608, while the sum is 56.

The spelling of 12739097981 in words is "twelve billion, seven hundred thirty-nine million, ninety-seven thousand, nine hundred eighty-one".