491957267 has 2 divisors, whose sum is σ = 491957268. Its totient is φ = 491957266.

The previous prime is 491957231. The next prime is 491957299. The reversal of 491957267 is 762759194.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491957267 is a prime.

It is not a weakly prime, because it can be changed into another prime (491957467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245978633 + 245978634.

It is an arithmetic number, because the mean of its divisors is an integer number (245978634).

Almost surely, 2^491957267 is an apocalyptic number.

491957267 is a deficient number, since it is larger than the sum of its proper divisors (1).

491957267 is an equidigital number, since it uses as much as digits as its factorization.

491957267 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 50.

The square root of 491957267 is about 22180.1097156890. The cubic root of 491957267 is about 789.4218207141.

The spelling of 491957267 in words is "four hundred ninety-one million, nine hundred fifty-seven thousand, two hundred sixty-seven".