129080921 has 2 divisors, whose sum is σ = 129080922. Its totient is φ = 129080920.

The previous prime is 129080893. The next prime is 129080947.

It is a happy number.

129080921 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91393600 + 37687321 = 9560^2 + 6139^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 129080921 - 2¹⁰ = 129079897 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (129080971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64540460 + 64540461.

It is an arithmetic number, because the mean of its divisors is an integer number (64540461).

Almost surely, 2^129080921 is an apocalyptic number.

It is an amenable number.

129080921 is a deficient number, since it is larger than the sum of its proper divisors (1).

129080921 is an equidigital number, since it uses as much as digits as its factorization.

129080921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 129080921 is about 11361.3784815048. The cubic root of 129080921 is about 505.3830652344.

The spelling of 129080921 in words is "one hundred twenty-nine million, eighty thousand, nine hundred twenty-one".