501641 has 4 divisors (see below), whose sum is σ = 573312. Its totient is φ = 429972.

The previous prime is 501637. The next prime is 501659. The reversal of 501641 is 146105.

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, and also an emirpimes, since its reverse is a distinct semiprime: 146105 = 5 ⋅29221.

It is a cyclic number.

It is not a de Polignac number, because 501641 - 2² = 501637 is a prime.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35825 + ... + 35838.

It is an arithmetic number, because the mean of its divisors is an integer number (143328).

2⁵⁰¹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

501641 is a deficient number, since it is larger than the sum of its proper divisors (71671).

501641 is an equidigital number, since it uses as much as digits as its factorization.

501641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71670.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 501641 is about 708.2661928964. The cubic root of 501641 is about 79.4567886158.

Adding to 501641 its reverse (146105), we get a palindrome (647746).

The spelling of 501641 in words is "five hundred one thousand, six hundred forty-one".