128475431 has 4 divisors (see below), whose sum is σ = 146829072. Its totient is φ = 110121792.

The previous prime is 128475421. The next prime is 128475527. The reversal of 128475431 is 134574821.

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 128475431 - 2⁶ = 128475367 is a prime.

It is a super-2 number, since 2×128475431² = 33011872741271522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128475391 and 128475400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128475421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9176810 + ... + 9176823.

It is an arithmetic number, because the mean of its divisors is an integer number (36707268).

Almost surely, 2^128475431 is an apocalyptic number.

128475431 is a deficient number, since it is larger than the sum of its proper divisors (18353641).

128475431 is an equidigital number, since it uses as much as digits as its factorization.

128475431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18353640.

The product of its digits is 26880, while the sum is 35.

The square root of 128475431 is about 11334.7003048162. The cubic root of 128475431 is about 504.5916131054.

The spelling of 128475431 in words is "one hundred twenty-eight million, four hundred seventy-five thousand, four hundred thirty-one".