491664111 has 4 divisors (see below), whose sum is σ = 655552152. Its totient is φ = 327776072.

The previous prime is 491664109. The next prime is 491664119. The reversal of 491664111 is 111466194.

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

It is a cyclic number.

It is not a de Polignac number, because 491664111 - 2¹ = 491664109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491664119) 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, 81944016 + ... + 81944021.

It is an arithmetic number, because the mean of its divisors is an integer number (163888038).

Almost surely, 2^491664111 is an apocalyptic number.

491664111 is a deficient number, since it is larger than the sum of its proper divisors (163888041).

491664111 is a wasteful number, since it uses less digits than its factorization.

491664111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163888040.

The product of its digits is 5184, while the sum is 33.

The square root of 491664111 is about 22173.5001973076. The cubic root of 491664111 is about 789.2649847839.

The spelling of 491664111 in words is "four hundred ninety-one million, six hundred sixty-four thousand, one hundred eleven".