797809421 has 2 divisors, whose sum is σ = 797809422. Its totient is φ = 797809420.

The previous prime is 797809417. The next prime is 797809427. The reversal of 797809421 is 124908797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 525097225 + 272712196 = 22915^2 + 16514^2 .

It is a cyclic number.

It is not a de Polignac number, because 797809421 - 2² = 797809417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (797809427) 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, 398904710 + 398904711.

It is an arithmetic number, because the mean of its divisors is an integer number (398904711).

Almost surely, 2^797809421 is an apocalyptic number.

It is an amenable number.

797809421 is a deficient number, since it is larger than the sum of its proper divisors (1).

797809421 is an equidigital number, since it uses as much as digits as its factorization.

797809421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 797809421 is about 28245.5203704942. The cubic root of 797809421 is about 927.4696782468.

The spelling of 797809421 in words is "seven hundred ninety-seven million, eight hundred nine thousand, four hundred twenty-one".