821425349 has 2 divisors, whose sum is σ = 821425350. Its totient is φ = 821425348.

The previous prime is 821425343. The next prime is 821425351. The reversal of 821425349 is 943524128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 615933124 + 205492225 = 24818^2 + 14335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821425349 is a prime.

Together with 821425351, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821425343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410712674 + 410712675.

It is an arithmetic number, because the mean of its divisors is an integer number (410712675).

Almost surely, 2^821425349 is an apocalyptic number.

It is an amenable number.

821425349 is a deficient number, since it is larger than the sum of its proper divisors (1).

821425349 is an equidigital number, since it uses as much as digits as its factorization.

821425349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 38.

The square root of 821425349 is about 28660.5189939052. The cubic root of 821425349 is about 936.5321706023.

The spelling of 821425349 in words is "eight hundred twenty-one million, four hundred twenty-five thousand, three hundred forty-nine".