491087 has 4 divisors (see below), whose sum is σ = 494760. Its totient is φ = 487416.

The previous prime is 491083. The next prime is 491129. The reversal of 491087 is 780194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 780194 = 2 ⋅390097.

It is a cyclic number.

It is not a de Polignac number, because 491087 - 2² = 491083 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 (491081) 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, 1628 + ... + 1905.

It is an arithmetic number, because the mean of its divisors is an integer number (123690).

2⁴⁹¹⁰⁸⁷ is an apocalyptic number.

491087 is a deficient number, since it is larger than the sum of its proper divisors (3673).

491087 is a wasteful number, since it uses less digits than its factorization.

491087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3672.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 491087 is about 700.7759984474. The cubic root of 491087 is about 78.8956053118.

The spelling of 491087 in words is "four hundred ninety-one thousand, eighty-seven".