505381 has 8 divisors (see below), whose sum is σ = 541280. Its totient is φ = 470448.

The previous prime is 505369. The next prime is 505399. The reversal of 505381 is 183505.

505381 = 154² + 155² + ... + 172².

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505381 is a prime.

It is a super-2 number, since 2×505381² = 510819910322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505301) 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, 1075 + ... + 1471.

It is an arithmetic number, because the mean of its divisors is an integer number (67660).

2⁵⁰⁵³⁸¹ is an apocalyptic number.

It is an amenable number.

505381 is a deficient number, since it is larger than the sum of its proper divisors (35899).

505381 is a wasteful number, since it uses less digits than its factorization.

505381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 505381 is about 710.9015402994. The cubic root of 505381 is about 79.6537640871.

Adding to 505381 its reverse (183505), we get a palindrome (688886).

The spelling of 505381 in words is "five hundred five thousand, three hundred eighty-one".