491374469 has 2 divisors, whose sum is σ = 491374470. Its totient is φ = 491374468.

The previous prime is 491374453. The next prime is 491374483. The reversal of 491374469 is 964473194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 429940225 + 61434244 = 20735^2 + 7838^2 .

It is a cyclic number.

It is not a de Polignac number, because 491374469 - 2⁴ = 491374453 is a prime.

It is a super-2 number, since 2×491374469² = 482897737570063922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491374439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245687234 + 245687235.

It is an arithmetic number, because the mean of its divisors is an integer number (245687235).

Almost surely, 2^491374469 is an apocalyptic number.

It is an amenable number.

491374469 is a deficient number, since it is larger than the sum of its proper divisors (1).

491374469 is an equidigital number, since it uses as much as digits as its factorization.

491374469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 47.

The square root of 491374469 is about 22166.9679703833. The cubic root of 491374469 is about 789.1099675753.

The spelling of 491374469 in words is "four hundred ninety-one million, three hundred seventy-four thousand, four hundred sixty-nine".