805789421 has 2 divisors, whose sum is σ = 805789422. Its totient is φ = 805789420.

The previous prime is 805789393. The next prime is 805789423. The reversal of 805789421 is 124987508.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 802588900 + 3200521 = 28330^2 + 1789^2 .

It is a cyclic number.

It is not a de Polignac number, because 805789421 - 2¹⁸ = 805527277 is a prime.

Together with 805789423, 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 (805789423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402894710 + 402894711.

It is an arithmetic number, because the mean of its divisors is an integer number (402894711).

Almost surely, 2^805789421 is an apocalyptic number.

It is an amenable number.

805789421 is a deficient number, since it is larger than the sum of its proper divisors (1).

805789421 is an equidigital number, since it uses as much as digits as its factorization.

805789421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 805789421 is about 28386.4302264304. The cubic root of 805789421 is about 930.5517291178.

The spelling of 805789421 in words is "eight hundred five million, seven hundred eighty-nine thousand, four hundred twenty-one".