501009 has 16 divisors (see below), whose sum is σ = 715392. Its totient is φ = 311168.

The previous prime is 501001. The next prime is 501013. The reversal of 501009 is 900105.

It is a cyclic number.

It is not a de Polignac number, because 501009 - 2³ = 501001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501001) 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, 3589 + ... + 3725.

It is an arithmetic number, because the mean of its divisors is an integer number (44712).

2⁵⁰¹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

501009 is a deficient number, since it is larger than the sum of its proper divisors (214383).

501009 is a wasteful number, since it uses less digits than its factorization.

501009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216.

The product of its (nonzero) digits is 45, while the sum is 15.

The square root of 501009 is about 707.8198923455. The cubic root of 501009 is about 79.4234063139.

The spelling of 501009 in words is "five hundred one thousand, nine".