128050785391 has 4 divisors (see below), whose sum is σ = 128195804152. Its totient is φ = 127905766632.

The previous prime is 128050785389. The next prime is 128050785403. The reversal of 128050785391 is 193587050821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128050785391 - 2¹ = 128050785389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128050785301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72508056 + ... + 72509821.

It is an arithmetic number, because the mean of its divisors is an integer number (32048951038).

Almost surely, 2^128050785391 is an apocalyptic number.

128050785391 is a deficient number, since it is larger than the sum of its proper divisors (145018761).

128050785391 is an equidigital number, since it uses as much as digits as its factorization.

128050785391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145018760.

The product of its (nonzero) digits is 604800, while the sum is 49.

The spelling of 128050785391 in words is "one hundred twenty-eight billion, fifty million, seven hundred eighty-five thousand, three hundred ninety-one".