128930749 has 2 divisors, whose sum is σ = 128930750. Its totient is φ = 128930748.

The previous prime is 128930731. The next prime is 128930777. The reversal of 128930749 is 947039821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124478649 + 4452100 = 11157^2 + 2110^2 .

It is a cyclic number.

It is not a de Polignac number, because 128930749 - 2¹⁷ = 128799677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128930719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64465374 + 64465375.

It is an arithmetic number, because the mean of its divisors is an integer number (64465375).

Almost surely, 2^128930749 is an apocalyptic number.

It is an amenable number.

128930749 is a deficient number, since it is larger than the sum of its proper divisors (1).

128930749 is an equidigital number, since it uses as much as digits as its factorization.

128930749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 128930749 is about 11354.7676770597. The cubic root of 128930749 is about 505.1870025997.

The spelling of 128930749 in words is "one hundred twenty-eight million, nine hundred thirty thousand, seven hundred forty-nine".