129226681 has 8 divisors (see below), whose sum is σ = 133400520. Its totient is φ = 125088768.

The previous prime is 129226679. The next prime is 129226729. The reversal of 129226681 is 186622921.

It can be written as a sum of positive squares in 4 ways, for example, as 94887081 + 34339600 = 9741^2 + 5860^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129226681 - 2¹ = 129226679 is a prime.

It is a super-2 number, since 2×129226681² = 33399070164551522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 129226681.

It is not an unprimeable number, because it can be changed into a prime (129226081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1576 + ... + 16153.

It is an arithmetic number, because the mean of its divisors is an integer number (16675065).

Almost surely, 2^129226681 is an apocalyptic number.

It is an amenable number.

129226681 is a deficient number, since it is larger than the sum of its proper divisors (4173839).

129226681 is a wasteful number, since it uses less digits than its factorization.

129226681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17963.

The product of its digits is 20736, while the sum is 37.

The square root of 129226681 is about 11367.7913861928. The cubic root of 129226681 is about 505.5732222426.

The spelling of 129226681 in words is "one hundred twenty-nine million, two hundred twenty-six thousand, six hundred eighty-one".