491323579 has 4 divisors (see below), whose sum is σ = 520224984. Its totient is φ = 462422176.

The previous prime is 491323577. The next prime is 491323583. The reversal of 491323579 is 975323194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491323579 - 2¹ = 491323577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491323577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14450677 + ... + 14450710.

It is an arithmetic number, because the mean of its divisors is an integer number (130056246).

Almost surely, 2^491323579 is an apocalyptic number.

491323579 is a deficient number, since it is larger than the sum of its proper divisors (28901405).

491323579 is a wasteful number, since it uses less digits than its factorization.

491323579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28901404.

The product of its digits is 204120, while the sum is 43.

The square root of 491323579 is about 22165.8200615272. The cubic root of 491323579 is about 789.0827248136.

The spelling of 491323579 in words is "four hundred ninety-one million, three hundred twenty-three thousand, five hundred seventy-nine".