643017 has 16 divisors (see below), whose sum is σ = 936000. Its totient is φ = 391104.

The previous prime is 643009. The next prime is 643021. The reversal of 643017 is 710346.

643017 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 643017 - 2³ = 643009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642984 and 643002.

It is not an unprimeable number, because it can be changed into a prime (643087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1459 + ... + 1847.

It is an arithmetic number, because the mean of its divisors is an integer number (58500).

2⁶⁴³⁰¹⁷ is an apocalyptic number.

It is an amenable number.

643017 is a deficient number, since it is larger than the sum of its proper divisors (292983).

643017 is a wasteful number, since it uses less digits than its factorization.

643017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 643017 is about 801.8834079840. The cubic root of 643017 is about 86.3125905686.

It can be divided in two parts, 64 and 3017, that added together give a triangular number (3081 = T₇₈).

The spelling of 643017 in words is "six hundred forty-three thousand, seventeen".