491814491 has 4 divisors (see below), whose sum is σ = 562073712. Its totient is φ = 421555272.

The previous prime is 491814469. The next prime is 491814503. The reversal of 491814491 is 194418194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194418194 = 2 ⋅97209097.

It is a cyclic number.

It is not a de Polignac number, because 491814491 - 2¹⁰ = 491813467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491811491) 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, 35129600 + ... + 35129613.

It is an arithmetic number, because the mean of its divisors is an integer number (140518428).

Almost surely, 2^491814491 is an apocalyptic number.

491814491 is a deficient number, since it is larger than the sum of its proper divisors (70259221).

491814491 is an equidigital number, since it uses as much as digits as its factorization.

491814491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70259220.

The product of its digits is 41472, while the sum is 41.

The square root of 491814491 is about 22176.8909227601. The cubic root of 491814491 is about 789.3454445714.

The spelling of 491814491 in words is "four hundred ninety-one million, eight hundred fourteen thousand, four hundred ninety-one".