503491 has 4 divisors (see below), whose sum is σ = 505000. Its totient is φ = 501984.

The previous prime is 503483. The next prime is 503501. The reversal of 503491 is 194305.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194305 = 5 ⋅38861.

It is a cyclic number.

It is not a de Polignac number, because 503491 - 2³ = 503483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (503431) 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, 6 + ... + 1003.

It is an arithmetic number, because the mean of its divisors is an integer number (126250).

2⁵⁰³⁴⁹¹ is an apocalyptic number.

503491 is a deficient number, since it is larger than the sum of its proper divisors (1509).

503491 is a wasteful number, since it uses less digits than its factorization.

503491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 503491 is about 709.5709971525. The cubic root of 503491 is about 79.5543449210.

Adding to 503491 its reverse (194305), we get a palindrome (697796).

The spelling of 503491 in words is "five hundred three thousand, four hundred ninety-one".