128359391 has 2 divisors, whose sum is σ = 128359392. Its totient is φ = 128359390.

The previous prime is 128359369. The next prime is 128359453. The reversal of 128359391 is 193953821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128359391 is a prime.

It is a super-2 number, since 2×128359391² = 32952266515781762, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128359591) 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, 64179695 + 64179696.

It is an arithmetic number, because the mean of its divisors is an integer number (64179696).

Almost surely, 2^128359391 is an apocalyptic number.

128359391 is a deficient number, since it is larger than the sum of its proper divisors (1).

128359391 is an equidigital number, since it uses as much as digits as its factorization.

128359391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 41.

The square root of 128359391 is about 11329.5803540996. The cubic root of 128359391 is about 504.4396503329.

The spelling of 128359391 in words is "one hundred twenty-eight million, three hundred fifty-nine thousand, three hundred ninety-one".