128912449 has 2 divisors, whose sum is σ = 128912450. Its totient is φ = 128912448.

The previous prime is 128912429. The next prime is 128912467. The reversal of 128912449 is 944219821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78004224 + 50908225 = 8832^2 + 7135^2 .

It is a cyclic number.

It is not a de Polignac number, because 128912449 - 2⁵ = 128912417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128912429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64456224 + 64456225.

It is an arithmetic number, because the mean of its divisors is an integer number (64456225).

Almost surely, 2^128912449 is an apocalyptic number.

It is an amenable number.

128912449 is a deficient number, since it is larger than the sum of its proper divisors (1).

128912449 is an equidigital number, since it uses as much as digits as its factorization.

128912449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 40.

The square root of 128912449 is about 11353.9618195588. The cubic root of 128912449 is about 505.1630999500.

The spelling of 128912449 in words is "one hundred twenty-eight million, nine hundred twelve thousand, four hundred forty-nine".