128938231 has 2 divisors, whose sum is σ = 128938232. Its totient is φ = 128938230.

The previous prime is 128938223. The next prime is 128938279. The reversal of 128938231 is 132839821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128938231 - 2³ = 128938223 is a prime.

It is a super-2 number, since 2×128938231² = 33250134826818722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128938211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64469115 + 64469116.

It is an arithmetic number, because the mean of its divisors is an integer number (64469116).

Almost surely, 2^128938231 is an apocalyptic number.

128938231 is a deficient number, since it is larger than the sum of its proper divisors (1).

128938231 is an equidigital number, since it uses as much as digits as its factorization.

128938231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 128938231 is about 11355.0971374093. The cubic root of 128938231 is about 505.1967746054.

The spelling of 128938231 in words is "one hundred twenty-eight million, nine hundred thirty-eight thousand, two hundred thirty-one".