128901749 has 2 divisors, whose sum is σ = 128901750. Its totient is φ = 128901748.

The previous prime is 128901743. The next prime is 128901761. The reversal of 128901749 is 947109821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110040100 + 18861649 = 10490^2 + 4343^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128901749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128901743) 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, 64450874 + 64450875.

It is an arithmetic number, because the mean of its divisors is an integer number (64450875).

Almost surely, 2^128901749 is an apocalyptic number.

It is an amenable number.

128901749 is a deficient number, since it is larger than the sum of its proper divisors (1).

128901749 is an equidigital number, since it uses as much as digits as its factorization.

128901749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 128901749 is about 11353.4906086190. The cubic root of 128901749 is about 505.1491230358.

The spelling of 128901749 in words is "one hundred twenty-eight million, nine hundred one thousand, seven hundred forty-nine".