506531 has 2 divisors, whose sum is σ = 506532. Its totient is φ = 506530.

The previous prime is 506507. The next prime is 506533. The reversal of 506531 is 135605.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-506531 is a prime.

It is a super-2 number, since 2×506531² = 513147307922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 506533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (506533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253265 + 253266.

It is an arithmetic number, because the mean of its divisors is an integer number (253266).

2⁵⁰⁶⁵³¹ is an apocalyptic number.

506531 is a deficient number, since it is larger than the sum of its proper divisors (1).

506531 is an equidigital number, since it uses as much as digits as its factorization.

506531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 506531 is about 711.7099128156. The cubic root of 506531 is about 79.7141359888.

The spelling of 506531 in words is "five hundred six thousand, five hundred thirty-one".