129112807681 has 16 divisors (see below), whose sum is σ = 153248755968. Its totient is φ = 107229427200.

The previous prime is 129112807669. The next prime is 129112807693. The reversal of 129112807681 is 186708211921.

It is an interprime number because it is at equal distance from previous prime (129112807669) and next prime (129112807693).

It is a cyclic number.

It is not a de Polignac number, because 129112807681 - 2⁷ = 129112807553 is a prime.

It is a super-2 number, since 2×129112807681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129112807381) 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 in 15 ways as a sum of consecutive naturals, for example, 4640185 + ... + 4667926.

It is an arithmetic number, because the mean of its divisors is an integer number (9578047248).

Almost surely, 2^129112807681 is an apocalyptic number.

129112807681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129112807681 is a deficient number, since it is larger than the sum of its proper divisors (24135948287).

129112807681 is a wasteful number, since it uses less digits than its factorization.

129112807681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9308232.

The product of its (nonzero) digits is 96768, while the sum is 46.

The spelling of 129112807681 in words is "one hundred twenty-nine billion, one hundred twelve million, eight hundred seven thousand, six hundred eighty-one".