491089 has 4 divisors (see below), whose sum is σ = 492724. Its totient is φ = 489456.

The previous prime is 491083. The next prime is 491129. The reversal of 491089 is 980194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 980194 = 2 ⋅490097.

It can be written as a sum of positive squares in 2 ways, for example, as 350464 + 140625 = 592^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 491089 - 2³ = 491081 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 491089.

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, 222 + ... + 1015.

It is an arithmetic number, because the mean of its divisors is an integer number (123181).

2⁴⁹¹⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

491089 is a deficient number, since it is larger than the sum of its proper divisors (1635).

491089 is a wasteful number, since it uses less digits than its factorization.

491089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 491089 is about 700.7774254355. Note that the first 3 decimals coincide. The cubic root of 491089 is about 78.8957124150.

It can be divided in two parts, 49 and 1089, that multiplied together give a square (53361 = 231²).

The spelling of 491089 in words is "four hundred ninety-one thousand, eighty-nine".