501801 has 4 divisors (see below), whose sum is σ = 669072. Its totient is φ = 334532.

The previous prime is 501779. The next prime is 501803. The reversal of 501801 is 108105.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 501801 - 2⁵ = 501769 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (501803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83631 + ... + 83636.

It is an arithmetic number, because the mean of its divisors is an integer number (167268).

2⁵⁰¹⁸⁰¹ is an apocalyptic number.

It is an amenable number.

501801 is a deficient number, since it is larger than the sum of its proper divisors (167271).

501801 is a wasteful number, since it uses less digits than its factorization.

501801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167270.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 501801 is about 708.3791357741. The cubic root of 501801 is about 79.4652353834.

Adding to 501801 its reverse (108105), we get a palindrome (609906).

The spelling of 501801 in words is "five hundred one thousand, eight hundred one".