520831 has 8 divisors (see below), whose sum is σ = 549504. Its totient is φ = 492960.

The previous prime is 520813. The next prime is 520837. The reversal of 520831 is 138025.

It is a happy number.

520831 is nontrivially palindromic in base 2 and base 5.

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 520831 - 2⁷ = 520703 is a prime.

It is a super-2 number, since 2×520831² = 542529861122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 520799 and 520808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520837) 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, 1485 + ... + 1801.

It is an arithmetic number, because the mean of its divisors is an integer number (68688).

2⁵²⁰⁸³¹ is an apocalyptic number.

520831 is a deficient number, since it is larger than the sum of its proper divisors (28673).

520831 is a wasteful number, since it uses less digits than its factorization.

520831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 520831 is about 721.6862199045. The cubic root of 520831 is about 80.4573285672.

Adding to 520831 its reverse (138025), we get a palindrome (658856).

The spelling of 520831 in words is "five hundred twenty thousand, eight hundred thirty-one".