798568509 has 4 divisors (see below), whose sum is σ = 1064758016. Its totient is φ = 532379004.

The previous prime is 798568469. The next prime is 798568531. The reversal of 798568509 is 905865897.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 798568509 - 2¹⁶ = 798502973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (798568409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133094749 + ... + 133094754.

It is an arithmetic number, because the mean of its divisors is an integer number (266189504).

Almost surely, 2^798568509 is an apocalyptic number.

It is an amenable number.

798568509 is a deficient number, since it is larger than the sum of its proper divisors (266189507).

798568509 is a wasteful number, since it uses less digits than its factorization.

798568509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266189506.

The product of its (nonzero) digits is 5443200, while the sum is 57.

The square root of 798568509 is about 28258.9544923375. The cubic root of 798568509 is about 927.7637367506.

The spelling of 798568509 in words is "seven hundred ninety-eight million, five hundred sixty-eight thousand, five hundred nine".