499943921 has 2 divisors, whose sum is σ = 499943922. Its totient is φ = 499943920.

The previous prime is 499943891. The next prime is 499943933. The reversal of 499943921 is 129349994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 337126321 + 162817600 = 18361^2 + 12760^2 .

It is a cyclic number.

It is not a de Polignac number, because 499943921 - 2¹⁴ = 499927537 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 499943921.

It is not a weakly prime, because it can be changed into another prime (499943971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249971960 + 249971961.

It is an arithmetic number, because the mean of its divisors is an integer number (249971961).

Almost surely, 2^499943921 is an apocalyptic number.

It is an amenable number.

499943921 is a deficient number, since it is larger than the sum of its proper divisors (1).

499943921 is an equidigital number, since it uses as much as digits as its factorization.

499943921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 50.

The square root of 499943921 is about 22359.4257752743. The cubic root of 499943921 is about 793.6708515868.

The spelling of 499943921 in words is "four hundred ninety-nine million, nine hundred forty-three thousand, nine hundred twenty-one".