128396231 has 2 divisors, whose sum is σ = 128396232. Its totient is φ = 128396230.

The previous prime is 128396221. The next prime is 128396239. The reversal of 128396231 is 132693821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128396231 - 2¹⁴ = 128379847 is a prime.

It is a super-2 number, since 2×128396231² = 32971184270010722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 128396191 and 128396200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128396239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64198115 + 64198116.

It is an arithmetic number, because the mean of its divisors is an integer number (64198116).

Almost surely, 2^128396231 is an apocalyptic number.

128396231 is a deficient number, since it is larger than the sum of its proper divisors (1).

128396231 is an equidigital number, since it uses as much as digits as its factorization.

128396231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 35.

The square root of 128396231 is about 11331.2060699645. The cubic root of 128396231 is about 504.4879048964.

The spelling of 128396231 in words is "one hundred twenty-eight million, three hundred ninety-six thousand, two hundred thirty-one".