129896449 has 2 divisors, whose sum is σ = 129896450. Its totient is φ = 129896448.

The previous prime is 129896447. The next prime is 129896477. The reversal of 129896449 is 944698921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92160000 + 37736449 = 9600^2 + 6143^2 .

It is an emirp because it is prime and its reverse (944698921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129896449 - 2¹ = 129896447 is a prime.

Together with 129896447, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 129896396 and 129896405.

It is not a weakly prime, because it can be changed into another prime (129896443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64948224 + 64948225.

It is an arithmetic number, because the mean of its divisors is an integer number (64948225).

Almost surely, 2^129896449 is an apocalyptic number.

It is an amenable number.

129896449 is a deficient number, since it is larger than the sum of its proper divisors (1).

129896449 is an equidigital number, since it uses as much as digits as its factorization.

129896449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 52.

The square root of 129896449 is about 11397.2123346018. The cubic root of 129896449 is about 506.4451614768.

The spelling of 129896449 in words is "one hundred twenty-nine million, eight hundred ninety-six thousand, four hundred forty-nine".