493394021 has 2 divisors, whose sum is σ = 493394022. Its totient is φ = 493394020.

The previous prime is 493393993. The next prime is 493394051. The reversal of 493394021 is 120493394.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 445632100 + 47761921 = 21110^2 + 6911^2 .

It is a cyclic number.

It is not a de Polignac number, because 493394021 - 2²² = 489199717 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 (493394051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246697010 + 246697011.

It is an arithmetic number, because the mean of its divisors is an integer number (246697011).

Almost surely, 2^493394021 is an apocalyptic number.

It is an amenable number.

493394021 is a deficient number, since it is larger than the sum of its proper divisors (1).

493394021 is an equidigital number, since it uses as much as digits as its factorization.

493394021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 493394021 is about 22212.4744456803. The cubic root of 493394021 is about 790.1895720884.

The spelling of 493394021 in words is "four hundred ninety-three million, three hundred ninety-four thousand, twenty-one".