491919 has 4 divisors (see below), whose sum is σ = 655896. Its totient is φ = 327944.

The previous prime is 491899. The next prime is 491923. The reversal of 491919 is 919194.

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 491919 - 2¹¹ = 489871 is a prime.

It is a super-2 number, since 2×491919² = 483968605122, which contains 22 as substring.

It is a D-number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 491919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491969) 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, 81984 + ... + 81989.

It is an arithmetic number, because the mean of its divisors is an integer number (163974).

2⁴⁹¹⁹¹⁹ is an apocalyptic number.

491919 is a deficient number, since it is larger than the sum of its proper divisors (163977).

491919 is a wasteful number, since it uses less digits than its factorization.

491919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163976.

The product of its digits is 2916, while the sum is 33.

The square root of 491919 is about 701.3693748661. The cubic root of 491919 is about 78.9401351736.

The spelling of 491919 in words is "four hundred ninety-one thousand, nine hundred nineteen".