491287 has 4 divisors (see below), whose sum is σ = 492840. Its totient is φ = 489736.

The previous prime is 491279. The next prime is 491297. The reversal of 491287 is 782194.

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 491287 - 2³ = 491279 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

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, 112 + ... + 997.

It is an arithmetic number, because the mean of its divisors is an integer number (123210).

2⁴⁹¹²⁸⁷ is an apocalyptic number.

491287 is a deficient number, since it is larger than the sum of its proper divisors (1553).

491287 is a wasteful number, since it uses less digits than its factorization.

491287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552.

The product of its digits is 4032, while the sum is 31.

The square root of 491287 is about 700.9186828727. The cubic root of 491287 is about 78.9063141946.

The spelling of 491287 in words is "four hundred ninety-one thousand, two hundred eighty-seven".