499965721 has 4 divisors (see below), whose sum is σ = 500390244. Its totient is φ = 499541200.

The previous prime is 499965703. The next prime is 499965731. The reversal of 499965721 is 127569994.

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

It can be written as a sum of positive squares in 2 ways, for example, as 482022025 + 17943696 = 21955^2 + 4236^2 .

It is a cyclic number.

It is not a de Polignac number, because 499965721 - 2⁹ = 499965209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (499965701) 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, 210490 + ... + 212851.

It is an arithmetic number, because the mean of its divisors is an integer number (125097561).

Almost surely, 2^499965721 is an apocalyptic number.

It is an amenable number.

499965721 is a deficient number, since it is larger than the sum of its proper divisors (424523).

499965721 is a wasteful number, since it uses less digits than its factorization.

499965721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424522.

The product of its digits is 1224720, while the sum is 52.

The square root of 499965721 is about 22359.9132601180. The cubic root of 499965721 is about 793.6823873960.

The spelling of 499965721 in words is "four hundred ninety-nine million, nine hundred sixty-five thousand, seven hundred twenty-one".