491270911 has 4 divisors (see below), whose sum is σ = 491344000. Its totient is φ = 491197824.

The previous prime is 491270861. The next prime is 491270929. The reversal of 491270911 is 119072194.

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 491270911 - 2²⁷ = 357053183 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 (491270951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25311 + ... + 40288.

It is an arithmetic number, because the mean of its divisors is an integer number (122836000).

Almost surely, 2^491270911 is an apocalyptic number.

491270911 is a deficient number, since it is larger than the sum of its proper divisors (73089).

491270911 is an equidigital number, since it uses as much as digits as its factorization.

491270911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73088.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 491270911 is about 22164.6319843123. The cubic root of 491270911 is about 789.0545282606.

The spelling of 491270911 in words is "four hundred ninety-one million, two hundred seventy thousand, nine hundred eleven".