129029381 has 16 divisors (see below), whose sum is σ = 144774000. Its totient is φ = 114175488.

The previous prime is 129029359. The next prime is 129029387. The reversal of 129029381 is 183920921.

It can be written as a sum of positive squares in 8 ways, for example, as 21077281 + 107952100 = 4591^2 + 10390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129029381 is a prime.

It is a super-2 number, since 2×129029381² = 33297162322486322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129029387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55025 + ... + 57321.

It is an arithmetic number, because the mean of its divisors is an integer number (9048375).

Almost surely, 2^129029381 is an apocalyptic number.

It is an amenable number.

129029381 is a deficient number, since it is larger than the sum of its proper divisors (15744619).

129029381 is a wasteful number, since it uses less digits than its factorization.

129029381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 129029381 is about 11359.1100443653. The cubic root of 129029381 is about 505.3157924195.

The spelling of 129029381 in words is "one hundred twenty-nine million, twenty-nine thousand, three hundred eighty-one".