1128913 has 4 divisors (see below), whose sum is σ = 1139380. Its totient is φ = 1118448.

The previous prime is 1128901. The next prime is 1128917. The reversal of 1128913 is 3198211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3198211 = 43 ⋅74377.

It can be written as a sum of positive squares in 2 ways, for example, as 677329 + 451584 = 823^2 + 672^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1128913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128917) 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, 5070 + ... + 5287.

It is an arithmetic number, because the mean of its divisors is an integer number (284845).

2^1128913 is an apocalyptic number.

It is an amenable number.

1128913 is a deficient number, since it is larger than the sum of its proper divisors (10467).

1128913 is a wasteful number, since it uses less digits than its factorization.

1128913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10466.

The product of its digits is 432, while the sum is 25.

The square root of 1128913 is about 1062.5031764658. The cubic root of 1128913 is about 104.1246348467.

It can be divided in two parts, 112 and 8913, that added together give a square (9025 = 95²).

The spelling of 1128913 in words is "one million, one hundred twenty-eight thousand, nine hundred thirteen".