499451721 has 16 divisors (see below), whose sum is σ = 710265024. Its totient is φ = 311089664.

The previous prime is 499451683. The next prime is 499451731. The reversal of 499451721 is 127154994.

It is not a de Polignac number, because 499451721 - 2⁹ = 499451209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (499451731) 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, 28755 + ... + 42728.

It is an arithmetic number, because the mean of its divisors is an integer number (44391564).

Almost surely, 2^499451721 is an apocalyptic number.

It is an amenable number.

499451721 is a deficient number, since it is larger than the sum of its proper divisors (210813303).

499451721 is a wasteful number, since it uses less digits than its factorization.

499451721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71640.

The product of its digits is 90720, while the sum is 42.

The square root of 499451721 is about 22348.4165210871. The cubic root of 499451721 is about 793.4103069905.

The spelling of 499451721 in words is "four hundred ninety-nine million, four hundred fifty-one thousand, seven hundred twenty-one".