128582031 has 4 divisors (see below), whose sum is σ = 171442712. Its totient is φ = 85721352.

The previous prime is 128582021. The next prime is 128582057. The reversal of 128582031 is 130285821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130285821 = 3 ⋅43428607.

It is not a de Polignac number, because 128582031 - 2⁷ = 128581903 is a prime.

It is a super-2 number, since 2×128582031² = 33066677392169922, which contains 22 as substring.

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 128582031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128582011) 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, 21430336 + ... + 21430341.

It is an arithmetic number, because the mean of its divisors is an integer number (42860678).

Almost surely, 2^128582031 is an apocalyptic number.

128582031 is a deficient number, since it is larger than the sum of its proper divisors (42860681).

128582031 is an equidigital number, since it uses as much as digits as its factorization.

128582031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42860680.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 128582031 is about 11339.4017037937. The cubic root of 128582031 is about 504.7311328965.

The spelling of 128582031 in words is "one hundred twenty-eight million, five hundred eighty-two thousand, thirty-one".