129995009 has 2 divisors, whose sum is σ = 129995010. Its totient is φ = 129995008.

The previous prime is 129995003. The next prime is 129995029. The reversal of 129995009 is 900599921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113209600 + 16785409 = 10640^2 + 4097^2 .

It is a cyclic number.

It is not a de Polignac number, because 129995009 - 2⁴ = 129994993 is a prime.

It is not a weakly prime, because it can be changed into another prime (129995003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64997504 + 64997505.

It is an arithmetic number, because the mean of its divisors is an integer number (64997505).

Almost surely, 2^129995009 is an apocalyptic number.

It is an amenable number.

129995009 is a deficient number, since it is larger than the sum of its proper divisors (1).

129995009 is an equidigital number, since it uses as much as digits as its factorization.

129995009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65610, while the sum is 44.

The square root of 129995009 is about 11401.5353790619. The cubic root of 129995009 is about 506.5732189059.

The spelling of 129995009 in words is "one hundred twenty-nine million, nine hundred ninety-five thousand, nine".