129280993 has 2 divisors, whose sum is σ = 129280994. Its totient is φ = 129280992.

The previous prime is 129280979. The next prime is 129281003. The reversal of 129280993 is 399082921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128527569 + 753424 = 11337^2 + 868^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129280993 is a prime.

It is not a weakly prime, because it can be changed into another prime (129283993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64640496 + 64640497.

It is an arithmetic number, because the mean of its divisors is an integer number (64640497).

Almost surely, 2^129280993 is an apocalyptic number.

It is an amenable number.

129280993 is a deficient number, since it is larger than the sum of its proper divisors (1).

129280993 is an equidigital number, since it uses as much as digits as its factorization.

129280993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 129280993 is about 11370.1799897803. The cubic root of 129280993 is about 505.6440405564.

The spelling of 129280993 in words is "one hundred twenty-nine million, two hundred eighty thousand, nine hundred ninety-three".