491895311 has 4 divisors (see below), whose sum is σ = 491993472. Its totient is φ = 491797152.

The previous prime is 491895293. The next prime is 491895343. The reversal of 491895311 is 113598194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113598194 = 2 ⋅56799097.

It is a cyclic number.

It is not a de Polignac number, because 491895311 - 2⁶ = 491895247 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 (491895211) 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, 41135 + ... + 51728.

It is an arithmetic number, because the mean of its divisors is an integer number (122998368).

Almost surely, 2^491895311 is an apocalyptic number.

491895311 is a deficient number, since it is larger than the sum of its proper divisors (98161).

491895311 is an equidigital number, since it uses as much as digits as its factorization.

491895311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98160.

The product of its digits is 38880, while the sum is 41.

The square root of 491895311 is about 22178.7130149610. The cubic root of 491895311 is about 789.3886799822.

The spelling of 491895311 in words is "four hundred ninety-one million, eight hundred ninety-five thousand, three hundred eleven".