498728509 has 2 divisors, whose sum is σ = 498728510. Its totient is φ = 498728508.

The previous prime is 498728453. The next prime is 498728521. The reversal of 498728509 is 905827894.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 469805625 + 28922884 = 21675^2 + 5378^2 .

It is a cyclic number.

It is not a de Polignac number, because 498728509 - 2¹¹ = 498726461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (498728539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249364254 + 249364255.

It is an arithmetic number, because the mean of its divisors is an integer number (249364255).

Almost surely, 2^498728509 is an apocalyptic number.

It is an amenable number.

498728509 is a deficient number, since it is larger than the sum of its proper divisors (1).

498728509 is an equidigital number, since it uses as much as digits as its factorization.

498728509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 52.

The square root of 498728509 is about 22332.2302737546. The cubic root of 498728509 is about 793.0271661635.

The spelling of 498728509 in words is "four hundred ninety-eight million, seven hundred twenty-eight thousand, five hundred nine".