494826821 has 2 divisors, whose sum is σ = 494826822. Its totient is φ = 494826820.

The previous prime is 494826811. The next prime is 494826841. The reversal of 494826821 is 128628494.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 492218596 + 2608225 = 22186^2 + 1615^2 .

It is a cyclic number.

It is not a de Polignac number, because 494826821 - 2²⁶ = 427717957 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 (494826811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247413410 + 247413411.

It is an arithmetic number, because the mean of its divisors is an integer number (247413411).

Almost surely, 2^494826821 is an apocalyptic number.

It is an amenable number.

494826821 is a deficient number, since it is larger than the sum of its proper divisors (1).

494826821 is an equidigital number, since it uses as much as digits as its factorization.

494826821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 44.

The square root of 494826821 is about 22244.7032122256. The cubic root of 494826821 is about 790.9537277085.

The spelling of 494826821 in words is "four hundred ninety-four million, eight hundred twenty-six thousand, eight hundred twenty-one".