491371123 has 4 divisors (see below), whose sum is σ = 491418360. Its totient is φ = 491323888.

The previous prime is 491371093. The next prime is 491371129. The reversal of 491371123 is 321173194.

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, and also an emirpimes, since its reverse is a distinct semiprime: 321173194 = 2 ⋅160586597.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491371123 is a prime.

It is a super-2 number, since 2×491371123² = 482891161036562258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491371129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418 + ... + 31351.

It is an arithmetic number, because the mean of its divisors is an integer number (122854590).

Almost surely, 2^491371123 is an apocalyptic number.

491371123 is a deficient number, since it is larger than the sum of its proper divisors (47237).

491371123 is a wasteful number, since it uses less digits than its factorization.

491371123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47236.

The product of its digits is 4536, while the sum is 31.

The square root of 491371123 is about 22166.8924975965. The cubic root of 491371123 is about 789.1081764309.

The spelling of 491371123 in words is "four hundred ninety-one million, three hundred seventy-one thousand, one hundred twenty-three".