491111423 has 4 divisors (see below), whose sum is σ = 535757928. Its totient is φ = 446464920.

The previous prime is 491111377. The next prime is 491111431. The reversal of 491111423 is 324111194.

It is a happy number.

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

It is not a de Polignac number, because 491111423 - 2¹⁶ = 491045887 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491111392 and 491111401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491111443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22323236 + ... + 22323257.

It is an arithmetic number, because the mean of its divisors is an integer number (133939482).

Almost surely, 2^491111423 is an apocalyptic number.

491111423 is a deficient number, since it is larger than the sum of its proper divisors (44646505).

491111423 is a wasteful number, since it uses less digits than its factorization.

491111423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44646504.

The product of its digits is 864, while the sum is 26.

The square root of 491111423 is about 22161.0338883365. The cubic root of 491111423 is about 788.9691318283.

The spelling of 491111423 in words is "four hundred ninety-one million, one hundred eleven thousand, four hundred twenty-three".