491271323 has 2 divisors, whose sum is σ = 491271324. Its totient is φ = 491271322.

The previous prime is 491271301. The next prime is 491271331. The reversal of 491271323 is 323172194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491271323 - 2¹⁶ = 491205787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491271323.

It is not a weakly prime, because it can be changed into another prime (491241323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245635661 + 245635662.

It is an arithmetic number, because the mean of its divisors is an integer number (245635662).

Almost surely, 2^491271323 is an apocalyptic number.

491271323 is a deficient number, since it is larger than the sum of its proper divisors (1).

491271323 is an equidigital number, since it uses as much as digits as its factorization.

491271323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 491271323 is about 22164.6412783965. The cubic root of 491271323 is about 789.0547488384.

The spelling of 491271323 in words is "four hundred ninety-one million, two hundred seventy-one thousand, three hundred twenty-three".