491600069 has 4 divisors (see below), whose sum is σ = 500875596. Its totient is φ = 482324544.

The previous prime is 491600041. The next prime is 491600089. The reversal of 491600069 is 960006194.

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

It can be written as a sum of positive squares in 2 ways, for example, as 275892100 + 215707969 = 16610^2 + 14687^2 .

It is a cyclic number.

It is not a de Polignac number, because 491600069 - 2²⁰ = 490551493 is a prime.

It is a super-2 number, since 2×491600069² = 483341255681609522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491600029) 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, 4637684 + ... + 4637789.

It is an arithmetic number, because the mean of its divisors is an integer number (125218899).

Almost surely, 2^491600069 is an apocalyptic number.

It is an amenable number.

491600069 is a deficient number, since it is larger than the sum of its proper divisors (9275527).

491600069 is an equidigital number, since it uses as much as digits as its factorization.

491600069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9275526.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 491600069 is about 22172.0560390777. The cubic root of 491600069 is about 789.2307145698.

The spelling of 491600069 in words is "four hundred ninety-one million, six hundred thousand, sixty-nine".