129108961 has 2 divisors, whose sum is σ = 129108962. Its totient is φ = 129108960.

The previous prime is 129108949. The next prime is 129108979. The reversal of 129108961 is 169801921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82446400 + 46662561 = 9080^2 + 6831^2 .

It is a cyclic number.

It is not a de Polignac number, because 129108961 - 2⁹ = 129108449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129108961.

It is not a weakly prime, because it can be changed into another prime (129108911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64554480 + 64554481.

It is an arithmetic number, because the mean of its divisors is an integer number (64554481).

Almost surely, 2^129108961 is an apocalyptic number.

It is an amenable number.

129108961 is a deficient number, since it is larger than the sum of its proper divisors (1).

129108961 is an equidigital number, since it uses as much as digits as its factorization.

129108961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 129108961 is about 11362.6124196859. The cubic root of 129108961 is about 505.4196570485.

The spelling of 129108961 in words is "one hundred twenty-nine million, one hundred eight thousand, nine hundred sixty-one".