128204449 has 2 divisors, whose sum is σ = 128204450. Its totient is φ = 128204448.

The previous prime is 128204441. The next prime is 128204459. The reversal of 128204449 is 944402821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119246400 + 8958049 = 10920^2 + 2993^2 .

It is an emirp because it is prime and its reverse (944402821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128204449 - 2³ = 128204441 is a prime.

It is not a weakly prime, because it can be changed into another prime (128204441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64102224 + 64102225.

It is an arithmetic number, because the mean of its divisors is an integer number (64102225).

Almost surely, 2^128204449 is an apocalyptic number.

It is an amenable number.

128204449 is a deficient number, since it is larger than the sum of its proper divisors (1).

128204449 is an equidigital number, since it uses as much as digits as its factorization.

128204449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 128204449 is about 11322.7403485199. The cubic root of 128204449 is about 504.2365997232.

The spelling of 128204449 in words is "one hundred twenty-eight million, two hundred four thousand, four hundred forty-nine".