844471421 has 2 divisors, whose sum is σ = 844471422. Its totient is φ = 844471420.

The previous prime is 844471409. The next prime is 844471423. The reversal of 844471421 is 124174448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 829152025 + 15319396 = 28795^2 + 3914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-844471421 is a prime.

Together with 844471423, 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 (844471423) 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, 422235710 + 422235711.

It is an arithmetic number, because the mean of its divisors is an integer number (422235711).

Almost surely, 2^844471421 is an apocalyptic number.

It is an amenable number.

844471421 is a deficient number, since it is larger than the sum of its proper divisors (1).

844471421 is an equidigital number, since it uses as much as digits as its factorization.

844471421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28672, while the sum is 35.

The square root of 844471421 is about 29059.7904500359. The cubic root of 844471421 is about 945.2100243324.

The spelling of 844471421 in words is "eight hundred forty-four million, four hundred seventy-one thousand, four hundred twenty-one".