128022702391 has 4 divisors (see below), whose sum is σ = 128026711800. Its totient is φ = 128018692984.

The previous prime is 128022702359. The next prime is 128022702421. The reversal of 128022702391 is 193207220821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193207220821 = 67 ⋅2883689863.

It is a cyclic number.

It is not a de Polignac number, because 128022702391 - 2⁵ = 128022702359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128022702391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128022702331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1956421 + ... + 2020798.

It is an arithmetic number, because the mean of its divisors is an integer number (32006677950).

Almost surely, 2^128022702391 is an apocalyptic number.

128022702391 is a deficient number, since it is larger than the sum of its proper divisors (4009409).

128022702391 is an equidigital number, since it uses as much as digits as its factorization.

128022702391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4009408.

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 128022702391 in words is "one hundred twenty-eight billion, twenty-two million, seven hundred two thousand, three hundred ninety-one".