43481105128729 has 2 divisors, whose sum is σ = 43481105128730. Its totient is φ = 43481105128728.

The previous prime is 43481105128693. The next prime is 43481105128789. The reversal of 43481105128729 is 92782150118434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28052329638025 + 15428775490704 = 5296445^2 + 3927948^2 .

It is a cyclic number.

It is not a de Polignac number, because 43481105128729 - 2⁴¹ = 41282081873177 is a prime.

It is a super-2 number, since 2×43481105128729² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 43481105128729.

It is not a weakly prime, because it can be changed into another prime (43481105128789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21740552564364 + 21740552564365.

It is an arithmetic number, because the mean of its divisors is an integer number (21740552564365).

Almost surely, 2^{43481105128729} is an apocalyptic number.

It is an amenable number.

43481105128729 is a deficient number, since it is larger than the sum of its proper divisors (1).

43481105128729 is an equidigital number, since it uses as much as digits as its factorization.

43481105128729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 43481105128729 in words is "forty-three trillion, four hundred eighty-one billion, one hundred five million, one hundred twenty-eight thousand, seven hundred twenty-nine".