501609 has 8 divisors (see below), whose sum is σ = 687040. Its totient is φ = 325296.

The previous prime is 501601. The next prime is 501617. The reversal of 501609 is 906105.

It is an interprime number because it is at equal distance from previous prime (501601) and next prime (501617).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 501609 - 2³ = 501601 is a prime.

It is a super-2 number, since 2×501609² = 503223177762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2149 + ... + 2370.

It is an arithmetic number, because the mean of its divisors is an integer number (85880).

2⁵⁰¹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

501609 is a deficient number, since it is larger than the sum of its proper divisors (185431).

501609 is a wasteful number, since it uses less digits than its factorization.

501609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4559.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 501609 is about 708.2436021596. The cubic root of 501609 is about 79.4550990468.

Subtracting 501609 from its reverse (906105), we obtain a square (404496 = 636²).

The spelling of 501609 in words is "five hundred one thousand, six hundred nine".