129037009 has 2 divisors, whose sum is σ = 129037010. Its totient is φ = 129037008.

The previous prime is 129037001. The next prime is 129037039. The reversal of 129037009 is 900730921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90782784 + 38254225 = 9528^2 + 6185^2 .

It is a cyclic number.

It is not a de Polignac number, because 129037009 - 2³ = 129037001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129037001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64518504 + 64518505.

It is an arithmetic number, because the mean of its divisors is an integer number (64518505).

Almost surely, 2^129037009 is an apocalyptic number.

It is an amenable number.

129037009 is a deficient number, since it is larger than the sum of its proper divisors (1).

129037009 is an equidigital number, since it uses as much as digits as its factorization.

129037009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 129037009 is about 11359.4458051438. The cubic root of 129037009 is about 505.3257500299.

The spelling of 129037009 in words is "one hundred twenty-nine million, thirty-seven thousand, nine".