489731819 has 4 divisors (see below), whose sum is σ = 498972096. Its totient is φ = 480491544.

The previous prime is 489731797. The next prime is 489731833. The reversal of 489731819 is 918137984.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-489731819 is a prime.

It is a super-2 number, since 2×489731819² = 479674509082097522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (489731899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4620059 + ... + 4620164.

It is an arithmetic number, because the mean of its divisors is an integer number (124743024).

Almost surely, 2^489731819 is an apocalyptic number.

489731819 is a deficient number, since it is larger than the sum of its proper divisors (9240277).

489731819 is an equidigital number, since it uses as much as digits as its factorization.

489731819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9240276.

The product of its digits is 435456, while the sum is 50.

The square root of 489731819 is about 22129.8852007867. The cubic root of 489731819 is about 788.2296623094.

The spelling of 489731819 in words is "four hundred eighty-nine million, seven hundred thirty-one thousand, eight hundred nineteen".