128752249 has 2 divisors, whose sum is σ = 128752250. Its totient is φ = 128752248.

The previous prime is 128752243. The next prime is 128752279. The reversal of 128752249 is 942257821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124099600 + 4652649 = 11140^2 + 2157^2 .

It is a cyclic number.

It is not a de Polignac number, because 128752249 - 2¹¹ = 128750201 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128752243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64376124 + 64376125.

It is an arithmetic number, because the mean of its divisors is an integer number (64376125).

Almost surely, 2^128752249 is an apocalyptic number.

It is an amenable number.

128752249 is a deficient number, since it is larger than the sum of its proper divisors (1).

128752249 is an equidigital number, since it uses as much as digits as its factorization.

128752249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The square root of 128752249 is about 11346.9048202583. The cubic root of 128752249 is about 504.9537571616.

The spelling of 128752249 in words is "one hundred twenty-eight million, seven hundred fifty-two thousand, two hundred forty-nine".