129527869 has 2 divisors, whose sum is σ = 129527870. Its totient is φ = 129527868.

The previous prime is 129527863. The next prime is 129527899. The reversal of 129527869 is 968725921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112635769 + 16892100 = 10613^2 + 4110^2 .

It is an emirp because it is prime and its reverse (968725921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129527869 - 2⁹ = 129527357 is a prime.

It is a super-2 number, since 2×129527869² = 33554937695362322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129527863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64763934 + 64763935.

It is an arithmetic number, because the mean of its divisors is an integer number (64763935).

Almost surely, 2^129527869 is an apocalyptic number.

It is an amenable number.

129527869 is a deficient number, since it is larger than the sum of its proper divisors (1).

129527869 is an equidigital number, since it uses as much as digits as its factorization.

129527869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 49.

The square root of 129527869 is about 11381.0311044299. The cubic root of 129527869 is about 505.9656965085.

The spelling of 129527869 in words is "one hundred twenty-nine million, five hundred twenty-seven thousand, eight hundred sixty-nine".