1128643 has 2 divisors, whose sum is σ = 1128644. Its totient is φ = 1128642.
The previous prime is 1128641. The next prime is 1128661. The reversal of 1128643 is 3468211.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 1128643 - 21 = 1128641 is a prime.
Together with 1128641, it forms a pair of twin primes.
It is not a weakly prime, because it can be changed into another prime (1128641) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564321 + 564322.
It is an arithmetic number, because the mean of its divisors is an integer number (564322).
21128643 is an apocalyptic number.
1128643 is a deficient number, since it is larger than the sum of its proper divisors (1).
1128643 is an equidigital number, since it uses as much as digits as its factorization.
1128643 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 1152, while the sum is 25.
The square root of 1128643 is about 1062.3761104242. The cubic root of 1128643 is about 104.1163330871.
It can be divided in two parts, 1128 and 643, that added together give a palindrome (1771).
The spelling of 1128643 in words is "one million, one hundred twenty-eight thousand, six hundred forty-three".
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