821943383 has 2 divisors, whose sum is σ = 821943384. Its totient is φ = 821943382.

The previous prime is 821943361. The next prime is 821943389. The reversal of 821943383 is 383349128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 821943383 - 2⁸ = 821943127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 821943383.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821943389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410971691 + 410971692.

It is an arithmetic number, because the mean of its divisors is an integer number (410971692).

Almost surely, 2^821943383 is an apocalyptic number.

821943383 is a deficient number, since it is larger than the sum of its proper divisors (1).

821943383 is an equidigital number, since it uses as much as digits as its factorization.

821943383 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 41.

The square root of 821943383 is about 28669.5549843384. The cubic root of 821943383 is about 936.7290047008.

The spelling of 821943383 in words is "eight hundred twenty-one million, nine hundred forty-three thousand, three hundred eighty-three".