797000821 has 2 divisors, whose sum is σ = 797000822. Its totient is φ = 797000820.

The previous prime is 797000779. The next prime is 797000861. The reversal of 797000821 is 128000797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 788991921 + 8008900 = 28089^2 + 2830^2 .

It is a cyclic number.

It is not a de Polignac number, because 797000821 - 2⁷ = 797000693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (797000861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 398500410 + 398500411.

It is an arithmetic number, because the mean of its divisors is an integer number (398500411).

Almost surely, 2^797000821 is an apocalyptic number.

It is an amenable number.

797000821 is a deficient number, since it is larger than the sum of its proper divisors (1).

797000821 is an equidigital number, since it uses as much as digits as its factorization.

797000821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 797000821 is about 28231.2029676385. The cubic root of 797000821 is about 927.1562343465.

The spelling of 797000821 in words is "seven hundred ninety-seven million, eight hundred twenty-one", and thus it is an aban number.