129006881 has 2 divisors, whose sum is σ = 129006882. Its totient is φ = 129006880.

The previous prime is 129006859. The next prime is 129006883. The reversal of 129006881 is 188600921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96334225 + 32672656 = 9815^2 + 5716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129006881 is a prime.

It is a super-2 number, since 2×129006881² = 33285550690696322, which contains 22 as substring.

Together with 129006883, 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 (129006883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64503440 + 64503441.

It is an arithmetic number, because the mean of its divisors is an integer number (64503441).

Almost surely, 2^129006881 is an apocalyptic number.

It is an amenable number.

129006881 is a deficient number, since it is larger than the sum of its proper divisors (1).

129006881 is an equidigital number, since it uses as much as digits as its factorization.

129006881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 129006881 is about 11358.1196066955. The cubic root of 129006881 is about 505.2864185767.

The spelling of 129006881 in words is "one hundred twenty-nine million, six thousand, eight hundred eighty-one".