643013 has 8 divisors (see below), whose sum is σ = 743232. Its totient is φ = 544896.

The previous prime is 643009. The next prime is 643021. The reversal of 643013 is 310346.

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

It is a cyclic number.

It is not a de Polignac number, because 643013 - 2² = 643009 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 642982 and 643000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643043) 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, 206 + ... + 1152.

It is an arithmetic number, because the mean of its divisors is an integer number (92904).

2⁶⁴³⁰¹³ is an apocalyptic number.

It is an amenable number.

643013 is a deficient number, since it is larger than the sum of its proper divisors (100219).

643013 is an equidigital number, since it uses as much as digits as its factorization.

643013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 643013 is about 801.8809138519. The cubic root of 643013 is about 86.3124115941.

Adding to 643013 its reverse (310346), we get a palindrome (953359).

The spelling of 643013 in words is "six hundred forty-three thousand, thirteen".