129608449 has 2 divisors, whose sum is σ = 129608450. Its totient is φ = 129608448.

The previous prime is 129608431. The next prime is 129608471. The reversal of 129608449 is 944806921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126967824 + 2640625 = 11268^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 129608449 - 2⁵ = 129608417 is a prime.

It is not a weakly prime, because it can be changed into another prime (129608249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64804224 + 64804225.

It is an arithmetic number, because the mean of its divisors is an integer number (64804225).

Almost surely, 2^129608449 is an apocalyptic number.

It is an amenable number.

129608449 is a deficient number, since it is larger than the sum of its proper divisors (1).

129608449 is an equidigital number, since it uses as much as digits as its factorization.

129608449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 129608449 is about 11384.5706550577. The cubic root of 129608449 is about 506.0705961066.

The spelling of 129608449 in words is "one hundred twenty-nine million, six hundred eight thousand, four hundred forty-nine".