499515021 has 6 divisors (see below), whose sum is σ = 721521710. Its totient is φ = 333010008.

The previous prime is 499515017. The next prime is 499515041. The reversal of 499515021 is 120515994.

It can be written as a sum of positive squares in only one way, i.e., 297562500 + 201952521 = 17250^2 + 14211^2 .

It is not a de Polignac number, because 499515021 - 2² = 499515017 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 (499515001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27750826 + ... + 27750843.

Almost surely, 2^499515021 is an apocalyptic number.

It is an amenable number.

499515021 is a deficient number, since it is larger than the sum of its proper divisors (222006689).

499515021 is a wasteful number, since it uses less digits than its factorization.

499515021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55501675 (or 55501672 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 499515021 is about 22349.8326839375. The cubic root of 499515021 is about 793.4438242446.

The spelling of 499515021 in words is "four hundred ninety-nine million, five hundred fifteen thousand, twenty-one".