498931821 has 6 divisors (see below), whose sum is σ = 720679310. Its totient is φ = 332621208.

The previous prime is 498931813. The next prime is 498931831. The reversal of 498931821 is 128139894.

It can be written as a sum of positive squares in only one way, i.e., 350213796 + 148718025 = 18714^2 + 12195^2 .

It is not a de Polignac number, because 498931821 - 2³ = 498931813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (498931831) 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 5 ways as a sum of consecutive naturals, for example, 27718426 + ... + 27718443.

Almost surely, 2^498931821 is an apocalyptic number.

It is an amenable number.

498931821 is a deficient number, since it is larger than the sum of its proper divisors (221747489).

498931821 is a wasteful number, since it uses less digits than its factorization.

498931821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55436875 (or 55436872 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 498931821 is about 22336.7817959526. The cubic root of 498931821 is about 793.1349135197.

The spelling of 498931821 in words is "four hundred ninety-eight million, nine hundred thirty-one thousand, eight hundred twenty-one".