491845 has 4 divisors (see below), whose sum is σ = 590220. Its totient is φ = 393472.

The previous prime is 491837. The next prime is 491851. The reversal of 491845 is 548194.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 367236 + 124609 = 606^2 + 353^2 .

It is a cyclic number.

It is not a de Polignac number, because 491845 - 2³ = 491837 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49180 + ... + 49189.

It is an arithmetic number, because the mean of its divisors is an integer number (147555).

2⁴⁹¹⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

491845 is a deficient number, since it is larger than the sum of its proper divisors (98375).

491845 is an equidigital number, since it uses as much as digits as its factorization.

491845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98374.

The product of its digits is 5760, while the sum is 31.

The square root of 491845 is about 701.3166189390. The cubic root of 491845 is about 78.9361766201.

The spelling of 491845 in words is "four hundred ninety-one thousand, eight hundred forty-five".