491718323 has 2 divisors, whose sum is σ = 491718324. Its totient is φ = 491718322.

The previous prime is 491718301. The next prime is 491718341. The reversal of 491718323 is 323817194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491718323 - 2²⁴ = 474941107 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (491718023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245859161 + 245859162.

It is an arithmetic number, because the mean of its divisors is an integer number (245859162).

Almost surely, 2^491718323 is an apocalyptic number.

491718323 is a deficient number, since it is larger than the sum of its proper divisors (1).

491718323 is an equidigital number, since it uses as much as digits as its factorization.

491718323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 491718323 is about 22174.7226138232. The cubic root of 491718323 is about 789.2939924335.

The spelling of 491718323 in words is "four hundred ninety-one million, seven hundred eighteen thousand, three hundred twenty-three".