799521857 has 2 divisors, whose sum is σ = 799521858. Its totient is φ = 799521856.

The previous prime is 799521829. The next prime is 799521859. The reversal of 799521857 is 758125997.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 728136256 + 71385601 = 26984^2 + 8449^2 .

It is a cyclic number.

It is not a de Polignac number, because 799521857 - 2¹⁰ = 799520833 is a prime.

Together with 799521859, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 799521799 and 799521808.

It is not a weakly prime, because it can be changed into another prime (799521859) 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, 399760928 + 399760929.

It is an arithmetic number, because the mean of its divisors is an integer number (399760929).

Almost surely, 2^799521857 is an apocalyptic number.

It is an amenable number.

799521857 is a deficient number, since it is larger than the sum of its proper divisors (1).

799521857 is an equidigital number, since it uses as much as digits as its factorization.

799521857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1587600, while the sum is 53.

The square root of 799521857 is about 28275.8175301794. The cubic root of 799521857 is about 928.1327845969.

The spelling of 799521857 in words is "seven hundred ninety-nine million, five hundred twenty-one thousand, eight hundred fifty-seven".