493721489 has 2 divisors, whose sum is σ = 493721490. Its totient is φ = 493721488.

The previous prime is 493721471. The next prime is 493721567. The reversal of 493721489 is 984127394.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 455182225 + 38539264 = 21335^2 + 6208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-493721489 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (493721689) 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, 246860744 + 246860745.

It is an arithmetic number, because the mean of its divisors is an integer number (246860745).

Almost surely, 2^493721489 is an apocalyptic number.

It is an amenable number.

493721489 is a deficient number, since it is larger than the sum of its proper divisors (1).

493721489 is an equidigital number, since it uses as much as digits as its factorization.

493721489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 47.

The square root of 493721489 is about 22219.8444864045. The cubic root of 493721489 is about 790.3643509749.

The spelling of 493721489 in words is "four hundred ninety-three million, seven hundred twenty-one thousand, four hundred eighty-nine".