493744681 has 2 divisors, whose sum is σ = 493744682. Its totient is φ = 493744680.

The previous prime is 493744679. The next prime is 493744709. The reversal of 493744681 is 186447394.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 450118656 + 43626025 = 21216^2 + 6605^2 .

It is a cyclic number.

It is not a de Polignac number, because 493744681 - 2¹ = 493744679 is a prime.

It is a super-2 number, since 2×493744681² = 487567620031583522, which contains 22 as substring.

Together with 493744679, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (493744081) 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, 246872340 + 246872341.

It is an arithmetic number, because the mean of its divisors is an integer number (246872341).

Almost surely, 2^493744681 is an apocalyptic number.

It is an amenable number.

493744681 is a deficient number, since it is larger than the sum of its proper divisors (1).

493744681 is an equidigital number, since it uses as much as digits as its factorization.

493744681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 46.

The square root of 493744681 is about 22220.3663561157. The cubic root of 493744681 is about 790.3767262670.

The spelling of 493744681 in words is "four hundred ninety-three million, seven hundred forty-four thousand, six hundred eighty-one".