491340439 has 2 divisors, whose sum is σ = 491340440. Its totient is φ = 491340438.

The previous prime is 491340419. The next prime is 491340461. The reversal of 491340439 is 934043194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491340439 - 2¹¹ = 491338391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491340398 and 491340407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491340419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245670219 + 245670220.

It is an arithmetic number, because the mean of its divisors is an integer number (245670220).

Almost surely, 2^491340439 is an apocalyptic number.

491340439 is a deficient number, since it is larger than the sum of its proper divisors (1).

491340439 is an equidigital number, since it uses as much as digits as its factorization.

491340439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 491340439 is about 22166.2003735417. The cubic root of 491340439 is about 789.0917506255.

The spelling of 491340439 in words is "four hundred ninety-one million, three hundred forty thousand, four hundred thirty-nine".