128390231 has 2 divisors, whose sum is σ = 128390232. Its totient is φ = 128390230.

The previous prime is 128390173. The next prime is 128390237. The reversal of 128390231 is 132093821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128390231 - 2⁶ = 128390167 is a prime.

It is a super-2 number, since 2×128390231² = 32968102832466722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 128390194 and 128390203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128390237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64195115 + 64195116.

It is an arithmetic number, because the mean of its divisors is an integer number (64195116).

Almost surely, 2^128390231 is an apocalyptic number.

128390231 is a deficient number, since it is larger than the sum of its proper divisors (1).

128390231 is an equidigital number, since it uses as much as digits as its factorization.

128390231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 128390231 is about 11330.9413112945. The cubic root of 128390231 is about 504.4800464762.

The spelling of 128390231 in words is "one hundred twenty-eight million, three hundred ninety thousand, two hundred thirty-one".