501309 has 12 divisors (see below), whose sum is σ = 751296. Its totient is φ = 334044.

The previous prime is 501299. The next prime is 501317. The reversal of 501309 is 903105.

It is a de Polignac number, because none of the positive numbers 2^k-501309 is a prime.

It is a super-3 number, since 3×501309³ = 377952967393339887, which contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 501291 and 501300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 789 + ... + 1274.

It is an arithmetic number, because the mean of its divisors is an integer number (62608).

2⁵⁰¹³⁰⁹ is an apocalyptic number.

It is an amenable number.

501309 is a deficient number, since it is larger than the sum of its proper divisors (249987).

501309 is an equidigital number, since it uses as much as digits as its factorization.

501309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078 (or 2066 counting only the distinct ones).

The product of its (nonzero) digits is 135, while the sum is 18.

The square root of 501309 is about 708.0317789478. The cubic root of 501309 is about 79.4392558414.

The spelling of 501309 in words is "five hundred one thousand, three hundred nine".