128018749 has 2 divisors, whose sum is σ = 128018750. Its totient is φ = 128018748.

The previous prime is 128018711. The next prime is 128018777. The reversal of 128018749 is 947810821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111978724 + 16040025 = 10582^2 + 4005^2 .

It is a cyclic number.

It is not a de Polignac number, because 128018749 - 2⁹ = 128018237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128012749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64009374 + 64009375.

It is an arithmetic number, because the mean of its divisors is an integer number (64009375).

Almost surely, 2^128018749 is an apocalyptic number.

It is an amenable number.

128018749 is a deficient number, since it is larger than the sum of its proper divisors (1).

128018749 is an equidigital number, since it uses as much as digits as its factorization.

128018749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 128018749 is about 11314.5370652095. The cubic root of 128018749 is about 503.9930252772.

The spelling of 128018749 in words is "one hundred twenty-eight million, eighteen thousand, seven hundred forty-nine".