501881 has 4 divisors (see below), whose sum is σ = 514164. Its totient is φ = 489600.

The previous prime is 501863. The next prime is 501889. The reversal of 501881 is 188105.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67600 + 434281 = 260^2 + 659^2 .

It is a cyclic number.

It is not a de Polignac number, because 501881 - 2⁶ = 501817 is a prime.

It is a super-2 number, since 2×501881² = 503769076322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (501889) 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, 6080 + ... + 6161.

It is an arithmetic number, because the mean of its divisors is an integer number (128541).

2⁵⁰¹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

501881 is a deficient number, since it is larger than the sum of its proper divisors (12283).

501881 is a wasteful number, since it uses less digits than its factorization.

501881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12282.

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 501881 is about 708.4356004606. The cubic root of 501881 is about 79.4694580939.

Adding to 501881 its reverse (188105), we get a palindrome (689986).

The spelling of 501881 in words is "five hundred one thousand, eight hundred eighty-one".