128145449 has 2 divisors, whose sum is σ = 128145450. Its totient is φ = 128145448.

The previous prime is 128145427. The next prime is 128145487. The reversal of 128145449 is 944541821.

It is an a-pointer prime, because the next prime (128145487) can be obtained adding 128145449 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87759424 + 40386025 = 9368^2 + 6355^2 .

It is a cyclic number.

It is not a de Polignac number, because 128145449 - 2²⁴ = 111368233 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (128145349) 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, 64072724 + 64072725.

It is an arithmetic number, because the mean of its divisors is an integer number (64072725).

Almost surely, 2^128145449 is an apocalyptic number.

It is an amenable number.

128145449 is a deficient number, since it is larger than the sum of its proper divisors (1).

128145449 is an equidigital number, since it uses as much as digits as its factorization.

128145449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 38.

The square root of 128145449 is about 11320.1346723438. The cubic root of 128145449 is about 504.1592375504.

The spelling of 128145449 in words is "one hundred twenty-eight million, one hundred forty-five thousand, four hundred forty-nine".