128422091 has 12 divisors (see below), whose sum is σ = 149893128. Its totient is φ = 109704672.

The previous prime is 128422081. The next prime is 128422103. The reversal of 128422091 is 190224821.

It is not a de Polignac number, because 128422091 - 2¹⁸ = 128159947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128422061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10775 + ... + 19311.

It is an arithmetic number, because the mean of its divisors is an integer number (12491094).

Almost surely, 2^128422091 is an apocalyptic number.

128422091 is a deficient number, since it is larger than the sum of its proper divisors (21471037).

128422091 is an equidigital number, since it uses as much as digits as its factorization.

128422091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8858 (or 8851 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 128422091 is about 11332.3471090503. The cubic root of 128422091 is about 504.5217718860.

The spelling of 128422091 in words is "one hundred twenty-eight million, four hundred twenty-two thousand, ninety-one".