128253091 has 4 divisors (see below), whose sum is σ = 129114000. Its totient is φ = 127392184.

The previous prime is 128253029. The next prime is 128253131. The reversal of 128253091 is 190352821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190352821 = 59 ⋅3226319.

It is a cyclic number.

It is not a de Polignac number, because 128253091 - 2¹⁷ = 128122019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128253001) 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, 430231 + ... + 430528.

It is an arithmetic number, because the mean of its divisors is an integer number (32278500).

Almost surely, 2^128253091 is an apocalyptic number.

128253091 is a deficient number, since it is larger than the sum of its proper divisors (860909).

128253091 is an equidigital number, since it uses as much as digits as its factorization.

128253091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860908.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 128253091 is about 11324.8881230677. Note that the first 3 decimals coincide. The cubic root of 128253091 is about 504.3003623970.

The spelling of 128253091 in words is "one hundred twenty-eight million, two hundred fifty-three thousand, ninety-one".