129689533 has 2 divisors, whose sum is σ = 129689534. Its totient is φ = 129689532.

The previous prime is 129689531. The next prime is 129689557. The reversal of 129689533 is 335986921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92198404 + 37491129 = 9602^2 + 6123^2 .

It is a cyclic number.

It is not a de Polignac number, because 129689533 - 2¹ = 129689531 is a prime.

Together with 129689531, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129689531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64844766 + 64844767.

It is an arithmetic number, because the mean of its divisors is an integer number (64844767).

Almost surely, 2^129689533 is an apocalyptic number.

It is an amenable number.

129689533 is a deficient number, since it is larger than the sum of its proper divisors (1).

129689533 is an equidigital number, since it uses as much as digits as its factorization.

129689533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 46.

The square root of 129689533 is about 11388.1312338768. The cubic root of 129689533 is about 506.1761079370.

The spelling of 129689533 in words is "one hundred twenty-nine million, six hundred eighty-nine thousand, five hundred thirty-three".