643112 has 16 divisors (see below), whose sum is σ = 1269600. Its totient is φ = 304560.

The previous prime is 643099. The next prime is 643121. The reversal of 643112 is 211346.

It is a nialpdrome in base 15.

It is an unprimeable number.

643112 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1964 + ... + 2267.

It is an arithmetic number, because the mean of its divisors is an integer number (79350).

2⁶⁴³¹¹² is an apocalyptic number.

It is an amenable number.

643112 is a deficient number, since it is larger than the sum of its proper divisors (626488).

643112 is a wasteful number, since it uses less digits than its factorization.

643112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4256 (or 4252 counting only the distinct ones).

The product of its digits is 144, while the sum is 17.

The square root of 643112 is about 801.9426413404. The cubic root of 643112 is about 86.3168409966.

Adding to 643112 its reverse (211346), we get a palindrome (854458).

The spelling of 643112 in words is "six hundred forty-three thousand, one hundred twelve".