499943621 has 2 divisors, whose sum is σ = 499943622. Its totient is φ = 499943620.

The previous prime is 499943579. The next prime is 499943659. The reversal of 499943621 is 126349994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 319336900 + 180606721 = 17870^2 + 13439^2 .

It is a cyclic number.

It is not a de Polignac number, because 499943621 - 2²⁶ = 432834757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (499943921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249971810 + 249971811.

It is an arithmetic number, because the mean of its divisors is an integer number (249971811).

Almost surely, 2^499943621 is an apocalyptic number.

It is an amenable number.

499943621 is a deficient number, since it is larger than the sum of its proper divisors (1).

499943621 is an equidigital number, since it uses as much as digits as its factorization.

499943621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 47.

The square root of 499943621 is about 22359.4190666931. The cubic root of 499943621 is about 793.6706928348.

The spelling of 499943621 in words is "four hundred ninety-nine million, nine hundred forty-three thousand, six hundred twenty-one".