129004549 has 2 divisors, whose sum is σ = 129004550. Its totient is φ = 129004548.

The previous prime is 129004541. The next prime is 129004559. The reversal of 129004549 is 945400921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80102500 + 48902049 = 8950^2 + 6993^2 .

It is an emirp because it is prime and its reverse (945400921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129004549 - 2³ = 129004541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129004541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64502274 + 64502275.

It is an arithmetic number, because the mean of its divisors is an integer number (64502275).

Almost surely, 2^129004549 is an apocalyptic number.

It is an amenable number.

129004549 is a deficient number, since it is larger than the sum of its proper divisors (1).

129004549 is an equidigital number, since it uses as much as digits as its factorization.

129004549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 129004549 is about 11358.0169483938. The cubic root of 129004549 is about 505.2833739457.

The spelling of 129004549 in words is "one hundred twenty-nine million, four thousand, five hundred forty-nine".