12895729981 has 2 divisors, whose sum is σ = 12895729982. Its totient is φ = 12895729980.

The previous prime is 12895729909. The next prime is 12895729993. The reversal of 12895729981 is 18992759821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8736640900 + 4159089081 = 93470^2 + 64491^2 .

It is a cyclic number.

It is not a de Polignac number, because 12895729981 - 2⁷ = 12895729853 is a prime.

It is a super-2 number, since 2×12895729981² (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 (12895729901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6447864990 + 6447864991.

It is an arithmetic number, because the mean of its divisors is an integer number (6447864991).

Almost surely, 2^12895729981 is an apocalyptic number.

It is an amenable number.

12895729981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12895729981 is an equidigital number, since it uses as much as digits as its factorization.

12895729981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 61.

The spelling of 12895729981 in words is "twelve billion, eight hundred ninety-five million, seven hundred twenty-nine thousand, nine hundred eighty-one".