129444881 has 2 divisors, whose sum is σ = 129444882. Its totient is φ = 129444880.

The previous prime is 129444859. The next prime is 129444883. The reversal of 129444881 is 188444921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109014481 + 20430400 = 10441^2 + 4520^2 .

It is a cyclic number.

It is not a de Polignac number, because 129444881 - 2¹⁰ = 129443857 is a prime.

It is a super-2 number, since 2×129444881² = 33511954434208322, which contains 22 as substring.

Together with 129444883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129444883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64722440 + 64722441.

It is an arithmetic number, because the mean of its divisors is an integer number (64722441).

Almost surely, 2^129444881 is an apocalyptic number.

It is an amenable number.

129444881 is a deficient number, since it is larger than the sum of its proper divisors (1).

129444881 is an equidigital number, since it uses as much as digits as its factorization.

129444881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73728, while the sum is 41.

The square root of 129444881 is about 11377.3846291668. The cubic root of 129444881 is about 505.8576166743.

The spelling of 129444881 in words is "one hundred twenty-nine million, four hundred forty-four thousand, eight hundred eighty-one".