491867123 has 8 divisors (see below), whose sum is σ = 541598400. Its totient is φ = 442971880.

The previous prime is 491867107. The next prime is 491867143. The reversal of 491867123 is 321768194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 491867123 - 2⁴ = 491867107 is a prime.

It is a super-3 number, since 3×491867123³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491867143) 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 7 ways as a sum of consecutive naturals, for example, 207773 + ... + 210126.

It is an arithmetic number, because the mean of its divisors is an integer number (67699800).

Almost surely, 2^491867123 is an apocalyptic number.

491867123 is a deficient number, since it is larger than the sum of its proper divisors (49731277).

491867123 is a wasteful number, since it uses less digits than its factorization.

491867123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418017.

The product of its digits is 72576, while the sum is 41.

The square root of 491867123 is about 22178.0775316527. The cubic root of 491867123 is about 789.3736010872.

The spelling of 491867123 in words is "four hundred ninety-one million, eight hundred sixty-seven thousand, one hundred twenty-three".