128233111 has 2 divisors, whose sum is σ = 128233112. Its totient is φ = 128233110.

The previous prime is 128233087. The next prime is 128233123. The reversal of 128233111 is 111332821.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (111332821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128233111 - 2¹¹ = 128231063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128233141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64116555 + 64116556.

It is an arithmetic number, because the mean of its divisors is an integer number (64116556).

Almost surely, 2^128233111 is an apocalyptic number.

128233111 is a deficient number, since it is larger than the sum of its proper divisors (1).

128233111 is an equidigital number, since it uses as much as digits as its factorization.

128233111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 22.

The square root of 128233111 is about 11324.0059607897. The cubic root of 128233111 is about 504.2741734388.

Adding to 128233111 its reverse (111332821), we get a palindrome (239565932).

The spelling of 128233111 in words is "one hundred twenty-eight million, two hundred thirty-three thousand, one hundred eleven".