799009021 has 2 divisors, whose sum is σ = 799009022. Its totient is φ = 799009020.

The previous prime is 799009009. The next prime is 799009039. The reversal of 799009021 is 120900997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 798684121 + 324900 = 28261^2 + 570^2 .

It is a cyclic number.

It is not a de Polignac number, because 799009021 - 2¹⁷ = 798877949 is a prime.

It is a Chen prime.

It is equal to p_41098168 and since 799009021 and 41098168 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 399504510 + 399504511.

It is an arithmetic number, because the mean of its divisors is an integer number (399504511).

Almost surely, 2^799009021 is an apocalyptic number.

It is an amenable number.

799009021 is a deficient number, since it is larger than the sum of its proper divisors (1).

799009021 is an equidigital number, since it uses as much as digits as its factorization.

799009021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 799009021 is about 28266.7476197740. The cubic root of 799009021 is about 927.9342985869.

The spelling of 799009021 in words is "seven hundred ninety-nine million, nine thousand, twenty-one".