128220591 has 8 divisors (see below), whose sum is σ = 171348480. Its totient is φ = 85286552.

The previous prime is 128220553. The next prime is 128220623. The reversal of 128220591 is 195022821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128220591 - 2¹¹ = 128218543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128228591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46911 + ... + 49568.

It is an arithmetic number, because the mean of its divisors is an integer number (21418560).

Almost surely, 2^128220591 is an apocalyptic number.

128220591 is a deficient number, since it is larger than the sum of its proper divisors (43127889).

128220591 is an equidigital number, since it uses as much as digits as its factorization.

128220591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96925.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 128220591 is about 11323.4531393917. The cubic root of 128220591 is about 504.2577613539.

The spelling of 128220591 in words is "one hundred twenty-eight million, two hundred twenty thousand, five hundred ninety-one".