499386721 has 2 divisors, whose sum is σ = 499386722. Its totient is φ = 499386720.

The previous prime is 499386689. The next prime is 499386731. The reversal of 499386721 is 127683994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 346518225 + 152868496 = 18615^2 + 12364^2 .

It is a cyclic number.

It is not a de Polignac number, because 499386721 - 2⁵ = 499386689 is a prime.

It is a super-2 number, since 2×499386721² = 498774194222263682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (499386731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249693360 + 249693361.

It is an arithmetic number, because the mean of its divisors is an integer number (249693361).

Almost surely, 2^499386721 is an apocalyptic number.

It is an amenable number.

499386721 is a deficient number, since it is larger than the sum of its proper divisors (1).

499386721 is an equidigital number, since it uses as much as digits as its factorization.

499386721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The square root of 499386721 is about 22346.9622320350. The cubic root of 499386721 is about 793.3758866417.

The spelling of 499386721 in words is "four hundred ninety-nine million, three hundred eighty-six thousand, seven hundred twenty-one".