491222297 has 2 divisors, whose sum is σ = 491222298. Its totient is φ = 491222296.

The previous prime is 491222267. The next prime is 491222299. The reversal of 491222297 is 792222194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 483516121 + 7706176 = 21989^2 + 2776^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491222297 is a prime.

Together with 491222299, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491222297.

It is not a weakly prime, because it can be changed into another prime (491222299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245611148 + 245611149.

It is an arithmetic number, because the mean of its divisors is an integer number (245611149).

Almost surely, 2^491222297 is an apocalyptic number.

It is an amenable number.

491222297 is a deficient number, since it is larger than the sum of its proper divisors (1).

491222297 is an equidigital number, since it uses as much as digits as its factorization.

491222297 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 491222297 is about 22163.5353001275. The cubic root of 491222297 is about 789.0285002848.

The spelling of 491222297 in words is "four hundred ninety-one million, two hundred twenty-two thousand, two hundred ninety-seven".