799724921 has 2 divisors, whose sum is σ = 799724922. Its totient is φ = 799724920.

The previous prime is 799724833. The next prime is 799724951. The reversal of 799724921 is 129427997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 636805225 + 162919696 = 25235^2 + 12764^2 .

It is an emirp because it is prime and its reverse (129427997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 799724921 - 2¹⁸ = 799462777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 799724921.

It is not a weakly prime, because it can be changed into another prime (799724951) 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, 399862460 + 399862461.

It is an arithmetic number, because the mean of its divisors is an integer number (399862461).

Almost surely, 2^799724921 is an apocalyptic number.

It is an amenable number.

799724921 is a deficient number, since it is larger than the sum of its proper divisors (1).

799724921 is an equidigital number, since it uses as much as digits as its factorization.

799724921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 50.

The square root of 799724921 is about 28279.4080737204. The cubic root of 799724921 is about 928.2113542238.

The spelling of 799724921 in words is "seven hundred ninety-nine million, seven hundred twenty-four thousand, nine hundred twenty-one".