494985509 has 2 divisors, whose sum is σ = 494985510. Its totient is φ = 494985508.

The previous prime is 494985503. The next prime is 494985541. The reversal of 494985509 is 905589494.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 488277409 + 6708100 = 22097^2 + 2590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-494985509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (494985503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247492754 + 247492755.

It is an arithmetic number, because the mean of its divisors is an integer number (247492755).

Almost surely, 2^494985509 is an apocalyptic number.

It is an amenable number.

494985509 is a deficient number, since it is larger than the sum of its proper divisors (1).

494985509 is an equidigital number, since it uses as much as digits as its factorization.

494985509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2332800, while the sum is 53.

The square root of 494985509 is about 22248.2697978966. The cubic root of 494985509 is about 791.0382700473.

The spelling of 494985509 in words is "four hundred ninety-four million, nine hundred eighty-five thousand, five hundred nine".