129047669 has 2 divisors, whose sum is σ = 129047670. Its totient is φ = 129047668.

The previous prime is 129047657. The next prime is 129047689. The reversal of 129047669 is 966740921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94672900 + 34374769 = 9730^2 + 5863^2 .

It is a cyclic number.

It is not a de Polignac number, because 129047669 - 2²⁴ = 112270453 is a prime.

It is a super-2 number, since 2×129047669² = 33306601748667122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129047689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64523834 + 64523835.

It is an arithmetic number, because the mean of its divisors is an integer number (64523835).

Almost surely, 2^129047669 is an apocalyptic number.

It is an amenable number.

129047669 is a deficient number, since it is larger than the sum of its proper divisors (1).

129047669 is an equidigital number, since it uses as much as digits as its factorization.

129047669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 129047669 is about 11359.9150084849. The cubic root of 129047669 is about 505.3396649633.

The spelling of 129047669 in words is "one hundred twenty-nine million, forty-seven thousand, six hundred sixty-nine".