823044421 has 2 divisors, whose sum is σ = 823044422. Its totient is φ = 823044420.

The previous prime is 823044407. The next prime is 823044457. The reversal of 823044421 is 124440328.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 778968100 + 44076321 = 27910^2 + 6639^2 .

It is a cyclic number.

It is not a de Polignac number, because 823044421 - 2⁹ = 823043909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 823044421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823044461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411522210 + 411522211.

It is an arithmetic number, because the mean of its divisors is an integer number (411522211).

Almost surely, 2^823044421 is an apocalyptic number.

It is an amenable number.

823044421 is a deficient number, since it is larger than the sum of its proper divisors (1).

823044421 is an equidigital number, since it uses as much as digits as its factorization.

823044421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 823044421 is about 28688.7507744760. The cubic root of 823044421 is about 937.1470846100.

Adding to 823044421 its reverse (124440328), we get a palindrome (947484749).

The spelling of 823044421 in words is "eight hundred twenty-three million, forty-four thousand, four hundred twenty-one".