129389081 has 2 divisors, whose sum is σ = 129389082. Its totient is φ = 129389080.

The previous prime is 129389077. The next prime is 129389089. The reversal of 129389081 is 180983921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101203600 + 28185481 = 10060^2 + 5309^2 .

It is a cyclic number.

It is not a de Polignac number, because 129389081 - 2² = 129389077 is a prime.

It is a super-2 number, since 2×129389081² = 33483068564049122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129389089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64694540 + 64694541.

It is an arithmetic number, because the mean of its divisors is an integer number (64694541).

Almost surely, 2^129389081 is an apocalyptic number.

It is an amenable number.

129389081 is a deficient number, since it is larger than the sum of its proper divisors (1).

129389081 is an equidigital number, since it uses as much as digits as its factorization.

129389081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 129389081 is about 11374.9321316657. The cubic root of 129389081 is about 505.7849192922.

The spelling of 129389081 in words is "one hundred twenty-nine million, three hundred eighty-nine thousand, eighty-one".