643011 has 8 divisors (see below), whose sum is σ = 894720. Its totient is φ = 409992.

The previous prime is 643009. The next prime is 643021. The reversal of 643011 is 110346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 643011 - 2¹ = 643009 is a prime.

It is a super-2 number, since 2×643011² = 826926292242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (643021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4591 + ... + 4728.

It is an arithmetic number, because the mean of its divisors is an integer number (111840).

2⁶⁴³⁰¹¹ is an apocalyptic number.

643011 is a deficient number, since it is larger than the sum of its proper divisors (251709).

643011 is a wasteful number, since it uses less digits than its factorization.

643011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9345.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 643011 is about 801.8796667830. The cubic root of 643011 is about 86.3123221065.

Adding to 643011 its reverse (110346), we get a palindrome (753357).

It can be divided in two parts, 6430 and 11, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 643011 in words is "six hundred forty-three thousand, eleven".