129094418081 has 2 divisors, whose sum is σ = 129094418082. Its totient is φ = 129094418080.

The previous prime is 129094418069. The next prime is 129094418129. The reversal of 129094418081 is 180814490921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65429035681 + 63665382400 = 255791^2 + 252320^2 .

It is a cyclic number.

It is not a de Polignac number, because 129094418081 - 2¹⁸ = 129094155937 is a prime.

It is a super-2 number, since 2×129094418081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129094418021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64547209040 + 64547209041.

It is an arithmetic number, because the mean of its divisors is an integer number (64547209041).

Almost surely, 2^129094418081 is an apocalyptic number.

It is an amenable number.

129094418081 is a deficient number, since it is larger than the sum of its proper divisors (1).

129094418081 is an equidigital number, since it uses as much as digits as its factorization.

129094418081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 47.

The spelling of 129094418081 in words is "one hundred twenty-nine billion, ninety-four million, four hundred eighteen thousand, eighty-one".