112128389 has 4 divisors (see below), whose sum is σ = 115158924. Its totient is φ = 109097856.

The previous prime is 112128371. The next prime is 112128407. The reversal of 112128389 is 983821211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 983821211 = 2551 ⋅385661.

It is an interprime number because it is at equal distance from previous prime (112128371) and next prime (112128407).

It can be written as a sum of positive squares in 2 ways, for example, as 54140164 + 57988225 = 7358^2 + 7615^2 .

It is a cyclic number.

It is not a de Polignac number, because 112128389 - 2¹² = 112124293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (112128349) 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, 1515212 + ... + 1515285.

It is an arithmetic number, because the mean of its divisors is an integer number (28789731).

Almost surely, 2^112128389 is an apocalyptic number.

It is an amenable number.

112128389 is a deficient number, since it is larger than the sum of its proper divisors (3030535).

112128389 is an equidigital number, since it uses as much as digits as its factorization.

112128389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030534.

The product of its digits is 6912, while the sum is 35.

The square root of 112128389 is about 10589.0693169891. The cubic root of 112128389 is about 482.2125704493.

The spelling of 112128389 in words is "one hundred twelve million, one hundred twenty-eight thousand, three hundred eighty-nine".