489821831 has 4 divisors (see below), whose sum is σ = 491643000. Its totient is φ = 488000664.

The previous prime is 489821809. The next prime is 489821837. The reversal of 489821831 is 138128984.

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 489821831 - 2²⁶ = 422712967 is a prime.

It is a super-2 number, since 2×489821831² = 479850852248385122, 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 (489821837) 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, 910181 + ... + 910718.

It is an arithmetic number, because the mean of its divisors is an integer number (122910750).

Almost surely, 2^489821831 is an apocalyptic number.

489821831 is a deficient number, since it is larger than the sum of its proper divisors (1821169).

489821831 is a wasteful number, since it uses less digits than its factorization.

489821831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821168.

The product of its digits is 110592, while the sum is 44.

The square root of 489821831 is about 22131.9188277926. The cubic root of 489821831 is about 788.2779511750.

The spelling of 489821831 in words is "four hundred eighty-nine million, eight hundred twenty-one thousand, eight hundred thirty-one".