531813 has 8 divisors (see below), whose sum is σ = 712800. Its totient is φ = 352688.

The previous prime is 531799. The next prime is 531821. The reversal of 531813 is 318135.

It is a happy number.

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 531813 - 2¹⁴ = 515429 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 531813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478 + ... + 1136.

It is an arithmetic number, because the mean of its divisors is an integer number (89100).

2⁵³¹⁸¹³ is an apocalyptic number.

It is an amenable number.

531813 is a deficient number, since it is larger than the sum of its proper divisors (180987).

531813 is a wasteful number, since it uses less digits than its factorization.

531813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931.

The product of its digits is 360, while the sum is 21.

The square root of 531813 is about 729.2550993994. The cubic root of 531813 is about 81.0188951499.

Adding to 531813 its reverse (318135), we get a palindrome (849948).

The spelling of 531813 in words is "five hundred thirty-one thousand, eight hundred thirteen".