129642269 has 2 divisors, whose sum is σ = 129642270. Its totient is φ = 129642268.

The previous prime is 129642259. The next prime is 129642277. The reversal of 129642269 is 962246921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128550244 + 1092025 = 11338^2 + 1045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129642269 is a prime.

It is a super-2 number, since 2×129642269² = 33614235822936722, 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 (129642259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64821134 + 64821135.

It is an arithmetic number, because the mean of its divisors is an integer number (64821135).

Almost surely, 2^129642269 is an apocalyptic number.

It is an amenable number.

129642269 is a deficient number, since it is larger than the sum of its proper divisors (1).

129642269 is an equidigital number, since it uses as much as digits as its factorization.

129642269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 41.

The square root of 129642269 is about 11386.0559018477. The cubic root of 129642269 is about 506.1146102616.

The spelling of 129642269 in words is "one hundred twenty-nine million, six hundred forty-two thousand, two hundred sixty-nine".