491111919 has 6 divisors (see below), whose sum is σ = 709383896. Its totient is φ = 327407940.

The previous prime is 491111911. The next prime is 491111923. The reversal of 491111919 is 919111194.

It is not a de Polignac number, because 491111919 - 2³ = 491111911 is a prime.

It is a super-2 number, since 2×491111919² = 482381833967725122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491111911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27283987 + ... + 27284004.

Almost surely, 2^491111919 is an apocalyptic number.

491111919 is a deficient number, since it is larger than the sum of its proper divisors (218271977).

491111919 is a wasteful number, since it uses less digits than its factorization.

491111919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54567997 (or 54567994 counting only the distinct ones).

The product of its digits is 2916, while the sum is 36.

The square root of 491111919 is about 22161.0450791473. The cubic root of 491111919 is about 788.9693974357.

The spelling of 491111919 in words is "four hundred ninety-one million, one hundred eleven thousand, nine hundred nineteen".