491111393 has 4 divisors (see below), whose sum is σ = 506953728. Its totient is φ = 475269060.

The previous prime is 491111377. The next prime is 491111431. The reversal of 491111393 is 393111194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 491111393 - 2⁴ = 491111377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491111353) 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, 7921121 + ... + 7921182.

It is an arithmetic number, because the mean of its divisors is an integer number (126738432).

Almost surely, 2^491111393 is an apocalyptic number.

It is an amenable number.

491111393 is a deficient number, since it is larger than the sum of its proper divisors (15842335).

491111393 is a wasteful number, since it uses less digits than its factorization.

491111393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15842334.

The product of its digits is 2916, while the sum is 32.

The square root of 491111393 is about 22161.0332114728. The cubic root of 491111393 is about 788.9691157633.

The spelling of 491111393 in words is "four hundred ninety-one million, one hundred eleven thousand, three hundred ninety-three".