128770111 has 2 divisors, whose sum is σ = 128770112. Its totient is φ = 128770110.

The previous prime is 128770091. The next prime is 128770127. The reversal of 128770111 is 111077821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128770111 - 2⁷ = 128769983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128770111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128770141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64385055 + 64385056.

It is an arithmetic number, because the mean of its divisors is an integer number (64385056).

Almost surely, 2^128770111 is an apocalyptic number.

128770111 is a deficient number, since it is larger than the sum of its proper divisors (1).

128770111 is an equidigital number, since it uses as much as digits as its factorization.

128770111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 28.

The square root of 128770111 is about 11347.6918798494. The cubic root of 128770111 is about 504.9771070889.

It can be divided in two parts, 128770 and 111, that added together give a square (128881 = 359²).

The spelling of 128770111 in words is "one hundred twenty-eight million, seven hundred seventy thousand, one hundred eleven".