491785339 has 2 divisors, whose sum is σ = 491785340. Its totient is φ = 491785338.

The previous prime is 491785337. The next prime is 491785351. The reversal of 491785339 is 933587194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491785339 - 2¹ = 491785337 is a prime.

Together with 491785337, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 491785292 and 491785301.

It is not a weakly prime, because it can be changed into another prime (491785331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245892669 + 245892670.

It is an arithmetic number, because the mean of its divisors is an integer number (245892670).

Almost surely, 2^491785339 is an apocalyptic number.

491785339 is a deficient number, since it is larger than the sum of its proper divisors (1).

491785339 is an equidigital number, since it uses as much as digits as its factorization.

491785339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 49.

The square root of 491785339 is about 22176.2336522684. The cubic root of 491785339 is about 789.3298482754.

The spelling of 491785339 in words is "four hundred ninety-one million, seven hundred eighty-five thousand, three hundred thirty-nine".