491371271 has 4 divisors (see below), whose sum is σ = 493198200. Its totient is φ = 489544344.

The previous prime is 491371219. The next prime is 491371291. The reversal of 491371271 is 172173194.

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 491371271 - 2⁶ = 491371207 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 (491371201) 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, 913061 + ... + 913598.

It is an arithmetic number, because the mean of its divisors is an integer number (123299550).

Almost surely, 2^491371271 is an apocalyptic number.

491371271 is a deficient number, since it is larger than the sum of its proper divisors (1826929).

491371271 is a wasteful number, since it uses less digits than its factorization.

491371271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826928.

The product of its digits is 10584, while the sum is 35.

The square root of 491371271 is about 22166.8958359081. The cubic root of 491371271 is about 789.1082556568.

The spelling of 491371271 in words is "four hundred ninety-one million, three hundred seventy-one thousand, two hundred seventy-one".