491382317 has 2 divisors, whose sum is σ = 491382318. Its totient is φ = 491382316.

The previous prime is 491382299. The next prime is 491382323. The reversal of 491382317 is 713283194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397563721 + 93818596 = 19939^2 + 9686^2 .

It is a cyclic number.

It is not a de Polignac number, because 491382317 - 2¹² = 491378221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491382337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245691158 + 245691159.

It is an arithmetic number, because the mean of its divisors is an integer number (245691159).

Almost surely, 2^491382317 is an apocalyptic number.

It is an amenable number.

491382317 is a deficient number, since it is larger than the sum of its proper divisors (1).

491382317 is an equidigital number, since it uses as much as digits as its factorization.

491382317 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 491382317 is about 22167.1449898267. The cubic root of 491382317 is about 789.1141686497.

The spelling of 491382317 in words is "four hundred ninety-one million, three hundred eighty-two thousand, three hundred seventeen".