491948273 has 2 divisors, whose sum is σ = 491948274. Its totient is φ = 491948272.

The previous prime is 491948267. The next prime is 491948293. The reversal of 491948273 is 372849194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 489825424 + 2122849 = 22132^2 + 1457^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491948273 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (491948293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245974136 + 245974137.

It is an arithmetic number, because the mean of its divisors is an integer number (245974137).

Almost surely, 2^491948273 is an apocalyptic number.

It is an amenable number.

491948273 is a deficient number, since it is larger than the sum of its proper divisors (1).

491948273 is an equidigital number, since it uses as much as digits as its factorization.

491948273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 491948273 is about 22179.9069655398. The cubic root of 491948273 is about 789.4170099282.

The spelling of 491948273 in words is "four hundred ninety-one million, nine hundred forty-eight thousand, two hundred seventy-three".