799521817 has 2 divisors, whose sum is σ = 799521818. Its totient is φ = 799521816.

The previous prime is 799521773. The next prime is 799521823. The reversal of 799521817 is 718125997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 797723536 + 1798281 = 28244^2 + 1341^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-799521817 is a prime.

It is not a weakly prime, because it can be changed into another prime (799521857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 399760908 + 399760909.

It is an arithmetic number, because the mean of its divisors is an integer number (399760909).

Almost surely, 2^799521817 is an apocalyptic number.

It is an amenable number.

799521817 is a deficient number, since it is larger than the sum of its proper divisors (1).

799521817 is an equidigital number, since it uses as much as digits as its factorization.

799521817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 49.

The square root of 799521817 is about 28275.8168228612. The cubic root of 799521817 is about 928.1327691188.

The spelling of 799521817 in words is "seven hundred ninety-nine million, five hundred twenty-one thousand, eight hundred seventeen".