128094391 has 2 divisors, whose sum is σ = 128094392. Its totient is φ = 128094390.

The previous prime is 128094349. The next prime is 128094397. The reversal of 128094391 is 193490821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128094391 - 2⁹ = 128093879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128094391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128094397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64047195 + 64047196.

It is an arithmetic number, because the mean of its divisors is an integer number (64047196).

Almost surely, 2^128094391 is an apocalyptic number.

128094391 is a deficient number, since it is larger than the sum of its proper divisors (1).

128094391 is an equidigital number, since it uses as much as digits as its factorization.

128094391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 128094391 is about 11317.8792624767. The cubic root of 128094391 is about 504.0922699442.

The spelling of 128094391 in words is "one hundred twenty-eight million, ninety-four thousand, three hundred ninety-one".