129829681 has 2 divisors, whose sum is σ = 129829682. Its totient is φ = 129829680.

The previous prime is 129829673. The next prime is 129829691. The reversal of 129829681 is 186928921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101909025 + 27920656 = 10095^2 + 5284^2 .

It is a cyclic number.

It is not a de Polignac number, because 129829681 - 2³ = 129829673 is a prime.

It is a super-2 number, since 2×129829681² = 33711492137123522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129829621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64914840 + 64914841.

It is an arithmetic number, because the mean of its divisors is an integer number (64914841).

Almost surely, 2^129829681 is an apocalyptic number.

It is an amenable number.

129829681 is a deficient number, since it is larger than the sum of its proper divisors (1).

129829681 is an equidigital number, since it uses as much as digits as its factorization.

129829681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 46.

The square root of 129829681 is about 11394.2828207834. The cubic root of 129829681 is about 506.3583740753.

The spelling of 129829681 in words is "one hundred twenty-nine million, eight hundred twenty-nine thousand, six hundred eighty-one".