499500821 has 16 divisors (see below), whose sum is σ = 533979264. Its totient is φ = 466228224.

The previous prime is 499500811. The next prime is 499500829. The reversal of 499500821 is 128005994.

It is not a de Polignac number, because 499500821 - 2²² = 495306517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499500829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161330 + ... + 164396.

It is an arithmetic number, because the mean of its divisors is an integer number (33373704).

Almost surely, 2^499500821 is an apocalyptic number.

It is an amenable number.

499500821 is a deficient number, since it is larger than the sum of its proper divisors (34478443).

499500821 is a wasteful number, since it uses less digits than its factorization.

499500821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3260.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 499500821 is about 22349.5150059235. The cubic root of 499500821 is about 793.4363056125.

The spelling of 499500821 in words is "four hundred ninety-nine million, five hundred thousand, eight hundred twenty-one".