505931 has 4 divisors (see below), whose sum is σ = 527952. Its totient is φ = 483912.

The previous prime is 505927. The next prime is 505949. The reversal of 505931 is 139505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 139505 = 5 ⋅27901.

It is a cyclic number.

It is not a de Polignac number, because 505931 - 2² = 505927 is a prime.

It is a super-2 number, since 2×505931² = 511932353522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 21997 = 505931 / (5 + 0 + 5 + 9 + 3 + 1).

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 505897 and 505906.

It is not an unprimeable number, because it can be changed into a prime (505961) 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, 10976 + ... + 11021.

It is an arithmetic number, because the mean of its divisors is an integer number (131988).

2⁵⁰⁵⁹³¹ is an apocalyptic number.

505931 is a deficient number, since it is larger than the sum of its proper divisors (22021).

505931 is a wasteful number, since it uses less digits than its factorization.

505931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22020.

The product of its (nonzero) digits is 675, while the sum is 23.

The square root of 505931 is about 711.2882678633. The cubic root of 505931 is about 79.6826490191.

The spelling of 505931 in words is "five hundred five thousand, nine hundred thirty-one".