128276311 has 4 divisors (see below), whose sum is σ = 128787624. Its totient is φ = 127765000.

The previous prime is 128276297. The next prime is 128276321. The reversal of 128276311 is 113672821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128276311 - 2¹⁵ = 128243543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128276321) 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 in 3 ways as a sum of consecutive naturals, for example, 255280 + ... + 255781.

It is an arithmetic number, because the mean of its divisors is an integer number (32196906).

Almost surely, 2^128276311 is an apocalyptic number.

128276311 is a deficient number, since it is larger than the sum of its proper divisors (511313).

128276311 is an equidigital number, since it uses as much as digits as its factorization.

128276311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511312.

The product of its digits is 4032, while the sum is 31.

The square root of 128276311 is about 11325.9132523607. The cubic root of 128276311 is about 504.3307947963.

The spelling of 128276311 in words is "one hundred twenty-eight million, two hundred seventy-six thousand, three hundred eleven".