491355271 has 4 divisors (see below), whose sum is σ = 536023944. Its totient is φ = 446686600.

The previous prime is 491355259. The next prime is 491355299. The reversal of 491355271 is 172553194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491355271 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 491355271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491355871) 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, 22334320 + ... + 22334341.

It is an arithmetic number, because the mean of its divisors is an integer number (134005986).

Almost surely, 2^491355271 is an apocalyptic number.

491355271 is a deficient number, since it is larger than the sum of its proper divisors (44668673).

491355271 is a wasteful number, since it uses less digits than its factorization.

491355271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44668672.

The product of its digits is 37800, while the sum is 37.

The square root of 491355271 is about 22166.5349344457. The cubic root of 491355271 is about 789.0996905996.

The spelling of 491355271 in words is "four hundred ninety-one million, three hundred fifty-five thousand, two hundred seventy-one".