129708881 has 2 divisors, whose sum is σ = 129708882. Its totient is φ = 129708880.

The previous prime is 129708863. The next prime is 129708883. The reversal of 129708881 is 188807921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68227600 + 61481281 = 8260^2 + 7841^2 .

It is a cyclic number.

It is not a de Polignac number, because 129708881 - 2²² = 125514577 is a prime.

It is a super-2 number, since 2×129708881² = 33648787620544322, which contains 22 as substring.

Together with 129708883, 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 (129708883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64854440 + 64854441.

It is an arithmetic number, because the mean of its divisors is an integer number (64854441).

Almost surely, 2^129708881 is an apocalyptic number.

It is an amenable number.

129708881 is a deficient number, since it is larger than the sum of its proper divisors (1).

129708881 is an equidigital number, since it uses as much as digits as its factorization.

129708881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 44.

The square root of 129708881 is about 11388.9806830989. The cubic root of 129708881 is about 506.2012783270.

The spelling of 129708881 in words is "one hundred twenty-nine million, seven hundred eight thousand, eight hundred eighty-one".