494549821 has 2 divisors, whose sum is σ = 494549822. Its totient is φ = 494549820.

The previous prime is 494549813. The next prime is 494549849. The reversal of 494549821 is 128945494.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 484220025 + 10329796 = 22005^2 + 3214^2 .

It is a cyclic number.

It is not a de Polignac number, because 494549821 - 2³ = 494549813 is a prime.

It is a super-2 number, since 2×494549821² = 489159050902264082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (494549801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247274910 + 247274911.

It is an arithmetic number, because the mean of its divisors is an integer number (247274911).

Almost surely, 2^494549821 is an apocalyptic number.

It is an amenable number.

494549821 is a deficient number, since it is larger than the sum of its proper divisors (1).

494549821 is an equidigital number, since it uses as much as digits as its factorization.

494549821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 46.

The square root of 494549821 is about 22238.4761393401. The cubic root of 494549821 is about 790.8061103548.

The spelling of 494549821 in words is "four hundred ninety-four million, five hundred forty-nine thousand, eight hundred twenty-one".