494898821 has 2 divisors, whose sum is σ = 494898822. Its totient is φ = 494898820.

The previous prime is 494898799. The next prime is 494898853. The reversal of 494898821 is 128898494.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 488896321 + 6002500 = 22111^2 + 2450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-494898821 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (494898721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247449410 + 247449411.

It is an arithmetic number, because the mean of its divisors is an integer number (247449411).

Almost surely, 2^494898821 is an apocalyptic number.

It is an amenable number.

494898821 is a deficient number, since it is larger than the sum of its proper divisors (1).

494898821 is an equidigital number, since it uses as much as digits as its factorization.

494898821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1327104, while the sum is 53.

The square root of 494898821 is about 22246.3215161518. The cubic root of 494898821 is about 790.9920885411.

The spelling of 494898821 in words is "four hundred ninety-four million, eight hundred ninety-eight thousand, eight hundred twenty-one".