128508943 has 2 divisors, whose sum is σ = 128508944. Its totient is φ = 128508942.

The previous prime is 128508907. The next prime is 128508949. The reversal of 128508943 is 349805821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128508943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128508896 and 128508905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128508949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64254471 + 64254472.

It is an arithmetic number, because the mean of its divisors is an integer number (64254472).

Almost surely, 2^128508943 is an apocalyptic number.

128508943 is a deficient number, since it is larger than the sum of its proper divisors (1).

128508943 is an equidigital number, since it uses as much as digits as its factorization.

128508943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 128508943 is about 11336.1785007118. The cubic root of 128508943 is about 504.6354824635.

The spelling of 128508943 in words is "one hundred twenty-eight million, five hundred eight thousand, nine hundred forty-three".