128069231 has 2 divisors, whose sum is σ = 128069232. Its totient is φ = 128069230.

The previous prime is 128069209. The next prime is 128069233. The reversal of 128069231 is 132960821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128069231 is a prime.

It is a super-2 number, since 2×128069231² = 32803455857862722, which contains 22 as substring.

Together with 128069233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128069233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64034615 + 64034616.

It is an arithmetic number, because the mean of its divisors is an integer number (64034616).

Almost surely, 2^128069231 is an apocalyptic number.

128069231 is a deficient number, since it is larger than the sum of its proper divisors (1).

128069231 is an equidigital number, since it uses as much as digits as its factorization.

128069231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 128069231 is about 11316.7676922344. The cubic root of 128069231 is about 504.0592635758.

The spelling of 128069231 in words is "one hundred twenty-eight million, sixty-nine thousand, two hundred thirty-one".