491217343 has 2 divisors, whose sum is σ = 491217344. Its totient is φ = 491217342.

The previous prime is 491217319. The next prime is 491217359. The reversal of 491217343 is 343712194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491217343 - 2²⁵ = 457662911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491217299 and 491217308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491217313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245608671 + 245608672.

It is an arithmetic number, because the mean of its divisors is an integer number (245608672).

Almost surely, 2^491217343 is an apocalyptic number.

491217343 is a deficient number, since it is larger than the sum of its proper divisors (1).

491217343 is an equidigital number, since it uses as much as digits as its factorization.

491217343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 491217343 is about 22163.4235396971. The cubic root of 491217343 is about 789.0258478127.

The spelling of 491217343 in words is "four hundred ninety-one million, two hundred seventeen thousand, three hundred forty-three".