822421531 has 2 divisors, whose sum is σ = 822421532. Its totient is φ = 822421530.

The previous prime is 822421513. The next prime is 822421541. The reversal of 822421531 is 135124228.

Together with previous prime (822421513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-822421531 is a prime.

It is a super-2 number, since 2×822421531² = 1352754349304767922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 822421531.

It is not a weakly prime, because it can be changed into another prime (822421541) 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 as a sum of consecutive naturals, namely, 411210765 + 411210766.

It is an arithmetic number, because the mean of its divisors is an integer number (411210766).

Almost surely, 2^822421531 is an apocalyptic number.

822421531 is a deficient number, since it is larger than the sum of its proper divisors (1).

822421531 is an equidigital number, since it uses as much as digits as its factorization.

822421531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 28.

The square root of 822421531 is about 28677.8927224439. The cubic root of 822421531 is about 936.9106101845.

Adding to 822421531 its reverse (135124228), we get a palindrome (957545759).

The spelling of 822421531 in words is "eight hundred twenty-two million, four hundred twenty-one thousand, five hundred thirty-one".