490398509 has 2 divisors, whose sum is σ = 490398510. Its totient is φ = 490398508.

The previous prime is 490398463. The next prime is 490398511. The reversal of 490398509 is 905893094.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 341436484 + 148962025 = 18478^2 + 12205^2 .

It is a cyclic number.

It is not a de Polignac number, because 490398509 - 2¹² = 490394413 is a prime.

Together with 490398511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (490398589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245199254 + 245199255.

It is an arithmetic number, because the mean of its divisors is an integer number (245199255).

Almost surely, 2^490398509 is an apocalyptic number.

It is an amenable number.

490398509 is a deficient number, since it is larger than the sum of its proper divisors (1).

490398509 is an equidigital number, since it uses as much as digits as its factorization.

490398509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 490398509 is about 22144.9431925214. The cubic root of 490398509 is about 788.5871821671.

The spelling of 490398509 in words is "four hundred ninety million, three hundred ninety-eight thousand, five hundred nine".