129730609 has 2 divisors, whose sum is σ = 129730610. Its totient is φ = 129730608.

The previous prime is 129730597. The next prime is 129730721. The reversal of 129730609 is 906037921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86434209 + 43296400 = 9297^2 + 6580^2 .

It is a cyclic number.

It is not a de Polignac number, because 129730609 - 2¹⁷ = 129599537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129730409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64865304 + 64865305.

It is an arithmetic number, because the mean of its divisors is an integer number (64865305).

Almost surely, 2^129730609 is an apocalyptic number.

It is an amenable number.

129730609 is a deficient number, since it is larger than the sum of its proper divisors (1).

129730609 is an equidigital number, since it uses as much as digits as its factorization.

129730609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 129730609 is about 11389.9345476609. The cubic root of 129730609 is about 506.2295419462.

The spelling of 129730609 in words is "one hundred twenty-nine million, seven hundred thirty thousand, six hundred nine".