128321243 has 2 divisors, whose sum is σ = 128321244. Its totient is φ = 128321242.

The previous prime is 128321197. The next prime is 128321257. The reversal of 128321243 is 342123821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128321243 - 2¹⁰ = 128320219 is a prime.

It is not a weakly prime, because it can be changed into another prime (128321273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64160621 + 64160622.

It is an arithmetic number, because the mean of its divisors is an integer number (64160622).

Almost surely, 2^128321243 is an apocalyptic number.

128321243 is a deficient number, since it is larger than the sum of its proper divisors (1).

128321243 is an equidigital number, since it uses as much as digits as its factorization.

128321243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 26.

The square root of 128321243 is about 11327.8966714920. The cubic root of 128321243 is about 504.3896727652.

The spelling of 128321243 in words is "one hundred twenty-eight million, three hundred twenty-one thousand, two hundred forty-three".