494774821 has 2 divisors, whose sum is σ = 494774822. Its totient is φ = 494774820.

The previous prime is 494774807. The next prime is 494774879. The reversal of 494774821 is 128477494.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 483384196 + 11390625 = 21986^2 + 3375^2 .

It is a cyclic number.

It is not a de Polignac number, because 494774821 - 2⁹ = 494774309 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 (494774521) 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, 247387410 + 247387411.

It is an arithmetic number, because the mean of its divisors is an integer number (247387411).

Almost surely, 2^494774821 is an apocalyptic number.

It is an amenable number.

494774821 is a deficient number, since it is larger than the sum of its proper divisors (1).

494774821 is an equidigital number, since it uses as much as digits as its factorization.

494774821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 46.

The square root of 494774821 is about 22243.5343639450. The cubic root of 494774821 is about 790.9260203485.

The spelling of 494774821 in words is "four hundred ninety-four million, seven hundred seventy-four thousand, eight hundred twenty-one".