128925449 has 2 divisors, whose sum is σ = 128925450. Its totient is φ = 128925448.

The previous prime is 128925437. The next prime is 128925451. The reversal of 128925449 is 944529821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128414224 + 511225 = 11332^2 + 715^2 .

It is a cyclic number.

It is not a de Polignac number, because 128925449 - 2²⁴ = 112148233 is a prime.

Together with 128925451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128925479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64462724 + 64462725.

It is an arithmetic number, because the mean of its divisors is an integer number (64462725).

Almost surely, 2^128925449 is an apocalyptic number.

It is an amenable number.

128925449 is a deficient number, since it is larger than the sum of its proper divisors (1).

128925449 is an equidigital number, since it uses as much as digits as its factorization.

128925449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 44.

The square root of 128925449 is about 11354.5342925194. The cubic root of 128925449 is about 505.1800802070.

The spelling of 128925449 in words is "one hundred twenty-eight million, nine hundred twenty-five thousand, four hundred forty-nine".