128311241 has 2 divisors, whose sum is σ = 128311242. Its totient is φ = 128311240.

The previous prime is 128311229. The next prime is 128311259. The reversal of 128311241 is 142113821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70627216 + 57684025 = 8404^2 + 7595^2 .

It is an emirp because it is prime and its reverse (142113821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128311241 - 2⁶ = 128311177 is a prime.

It is not a weakly prime, because it can be changed into another prime (128310241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64155620 + 64155621.

It is an arithmetic number, because the mean of its divisors is an integer number (64155621).

Almost surely, 2^128311241 is an apocalyptic number.

It is an amenable number.

128311241 is a deficient number, since it is larger than the sum of its proper divisors (1).

128311241 is an equidigital number, since it uses as much as digits as its factorization.

128311241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 23.

The square root of 128311241 is about 11327.4551864044. The cubic root of 128311241 is about 504.3765675394.

The spelling of 128311241 in words is "one hundred twenty-eight million, three hundred eleven thousand, two hundred forty-one".