501091 has 8 divisors (see below), whose sum is σ = 533520. Its totient is φ = 469728.

The previous prime is 501089. The next prime is 501103. The reversal of 501091 is 190105.

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

It is a cyclic number.

It is not a de Polignac number, because 501091 - 2¹ = 501089 is a prime.

It is a Duffinian number.

501091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (501001) 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 7 ways as a sum of consecutive naturals, for example, 840 + ... + 1306.

It is an arithmetic number, because the mean of its divisors is an integer number (66690).

2⁵⁰¹⁰⁹¹ is an apocalyptic number.

501091 is a deficient number, since it is larger than the sum of its proper divisors (32429).

501091 is a wasteful number, since it uses less digits than its factorization.

501091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533.

The product of its (nonzero) digits is 45, while the sum is 16.

The square root of 501091 is about 707.8778143154. The cubic root of 501091 is about 79.4277391463.

Adding to 501091 its reverse (190105), we get a palindrome (691196).

The spelling of 501091 in words is "five hundred one thousand, ninety-one".