799717861 has 2 divisors, whose sum is σ = 799717862. Its totient is φ = 799717860.

The previous prime is 799717823. The next prime is 799717873. The reversal of 799717861 is 168717997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 485364961 + 314352900 = 22031^2 + 17730^2 .

It is a cyclic number.

It is not a de Polignac number, because 799717861 - 2²⁷ = 665500133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (799517861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 399858930 + 399858931.

It is an arithmetic number, because the mean of its divisors is an integer number (399858931).

Almost surely, 2^799717861 is an apocalyptic number.

It is an amenable number.

799717861 is a deficient number, since it is larger than the sum of its proper divisors (1).

799717861 is an equidigital number, since it uses as much as digits as its factorization.

799717861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 55.

The square root of 799717861 is about 28279.2832476355. The cubic root of 799717861 is about 928.2086227882.

The spelling of 799717861 in words is "seven hundred ninety-nine million, seven hundred seventeen thousand, eight hundred sixty-one".