822531 has 4 divisors (see below), whose sum is σ = 1096712. Its totient is φ = 548352.

The previous prime is 822517. The next prime is 822539. The reversal of 822531 is 135228.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 822531 - 2¹⁰ = 821507 is a prime.

It is a super-2 number, since 2×822531² = 1353114491922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 822498 and 822507.

It is not an unprimeable number, because it can be changed into a prime (822539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137086 + ... + 137091.

It is an arithmetic number, because the mean of its divisors is an integer number (274178).

2⁸²²⁵³¹ is an apocalyptic number.

822531 is a deficient number, since it is larger than the sum of its proper divisors (274181).

822531 is a wasteful number, since it uses less digits than its factorization.

822531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274180.

The product of its digits is 480, while the sum is 21.

The square root of 822531 is about 906.9349480531. The cubic root of 822531 is about 93.6952177724.

Adding to 822531 its reverse (135228), we get a palindrome (957759).

It can be divided in two parts, 8225 and 31, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 822531 in words is "eight hundred twenty-two thousand, five hundred thirty-one".