491291 has 4 divisors (see below), whose sum is σ = 501792. Its totient is φ = 480792.

The previous prime is 491279. The next prime is 491297. The reversal of 491291 is 192194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192194 = 2 ⋅96097.

It is a cyclic number.

It is not a de Polignac number, because 491291 - 2¹⁰ = 490267 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491291.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 491291.

It is not an unprimeable number, because it can be changed into a prime (491297) 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, 5180 + ... + 5273.

It is an arithmetic number, because the mean of its divisors is an integer number (125448).

2⁴⁹¹²⁹¹ is an apocalyptic number.

491291 is a deficient number, since it is larger than the sum of its proper divisors (10501).

491291 is a wasteful number, since it uses less digits than its factorization.

491291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500.

The product of its digits is 648, while the sum is 26.

The square root of 491291 is about 700.9215362649. The cubic root of 491291 is about 78.9065283426.

The spelling of 491291 in words is "four hundred ninety-one thousand, two hundred ninety-one".