129944081 has 2 divisors, whose sum is σ = 129944082. Its totient is φ = 129944080.

The previous prime is 129944069. The next prime is 129944093. The reversal of 129944081 is 180449921.

It is a balanced prime because it is at equal distance from previous prime (129944069) and next prime (129944093).

It can be written as a sum of positive squares in only one way, i.e., 65286400 + 64657681 = 8080^2 + 8041^2 .

It is a cyclic number.

It is not a de Polignac number, because 129944081 - 2²⁶ = 62835217 is a prime.

It is a super-2 number, since 2×129944081² = 33770928373869122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129946081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64972040 + 64972041.

It is an arithmetic number, because the mean of its divisors is an integer number (64972041).

Almost surely, 2^129944081 is an apocalyptic number.

It is an amenable number.

129944081 is a deficient number, since it is larger than the sum of its proper divisors (1).

129944081 is an equidigital number, since it uses as much as digits as its factorization.

129944081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 129944081 is about 11399.3017768634. The cubic root of 129944081 is about 506.5070570563.

The spelling of 129944081 in words is "one hundred twenty-nine million, nine hundred forty-four thousand, eighty-one".