491123 has 4 divisors (see below), whose sum is σ = 492528. Its totient is φ = 489720.

The previous prime is 491083. The next prime is 491129. The reversal of 491123 is 321194.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 491123 - 2⁶ = 491059 is a prime.

It is a super-2 number, since 2×491123² = 482403602258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491095 and 491104.

It is not an unprimeable number, because it can be changed into a prime (491129) 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, 290 + ... + 1032.

It is an arithmetic number, because the mean of its divisors is an integer number (123132).

2⁴⁹¹¹²³ is an apocalyptic number.

491123 is a deficient number, since it is larger than the sum of its proper divisors (1405).

491123 is an equidigital number, since it uses as much as digits as its factorization.

491123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1404.

The product of its digits is 216, while the sum is 20.

The square root of 491123 is about 700.8016837879. The cubic root of 491123 is about 78.8975331252.

The spelling of 491123 in words is "four hundred ninety-one thousand, one hundred twenty-three".