129973309 has 2 divisors, whose sum is σ = 129973310. Its totient is φ = 129973308.

The previous prime is 129973237. The next prime is 129973351. The reversal of 129973309 is 903379921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75168900 + 54804409 = 8670^2 + 7403^2 .

It is a cyclic number.

It is not a de Polignac number, because 129973309 - 2¹³ = 129965117 is a prime.

It is a super-2 number, since 2×129973309² = 33786122104818962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129973369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64986654 + 64986655.

It is an arithmetic number, because the mean of its divisors is an integer number (64986655).

Almost surely, 2^129973309 is an apocalyptic number.

It is an amenable number.

129973309 is a deficient number, since it is larger than the sum of its proper divisors (1).

129973309 is an equidigital number, since it uses as much as digits as its factorization.

129973309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 43.

The square root of 129973309 is about 11400.5837131263. The cubic root of 129973309 is about 506.5450300016.

The spelling of 129973309 in words is "one hundred twenty-nine million, nine hundred seventy-three thousand, three hundred nine".