491675220317 has 2 divisors, whose sum is σ = 491675220318. Its totient is φ = 491675220316.

The previous prime is 491675220269. The next prime is 491675220341. The reversal of 491675220317 is 713022576194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413286979876 + 78388240441 = 642874^2 + 279979^2 .

It is a cyclic number.

It is not a de Polignac number, because 491675220317 - 2²⁰ = 491674171741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491675220397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245837610158 + 245837610159.

It is an arithmetic number, because the mean of its divisors is an integer number (245837610159).

Almost surely, 2^491675220317 is an apocalyptic number.

It is an amenable number.

491675220317 is a deficient number, since it is larger than the sum of its proper divisors (1).

491675220317 is an equidigital number, since it uses as much as digits as its factorization.

491675220317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 491675220317 in words is "four hundred ninety-one billion, six hundred seventy-five million, two hundred twenty thousand, three hundred seventeen".