500001 has 4 divisors (see below), whose sum is σ = 666672. Its totient is φ = 333332.

The previous prime is 499979. The next prime is 500009. The reversal of 500001 is 100005.

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 a trimorphic number since its cube, 125000750001500001, ends in 500001.

It is not a de Polignac number, because 500001 - 2⁵ = 499969 is a prime.

It is a D-number.

It is a Curzon number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (500009) 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, 83331 + ... + 83336.

It is an arithmetic number, because the mean of its divisors is an integer number (166668).

2⁵⁰⁰⁰⁰¹ is an apocalyptic number.

It is an amenable number.

500001 is a deficient number, since it is larger than the sum of its proper divisors (166671).

500001 is a wasteful number, since it uses less digits than its factorization.

500001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166670.

The product of its (nonzero) digits is 5, while the sum is 6.

The square root of 500001 is about 707.1074882930. The cubic root of 500001 is about 79.3701055117.

Adding to 500001 its reverse (100005), we get a palindrome (600006).

The spelling of 500001 in words is "five hundred thousand, one".