491204901717 has 6 divisors (see below), whose sum is σ = 709518191382. Its totient is φ = 327469934472.

The previous prime is 491204901641. The next prime is 491204901791. The reversal of 491204901717 is 717109402194.

491204901717 is a `hidden beast` number, since 4 + 91 + 2 + 0 + 490 + 1 + 71 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 277575137316 + 213629764401 = 526854^2 + 462201^2 .

It is not a de Polignac number, because 491204901717 - 2⁷ = 491204901589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491204901017) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27289161198 + ... + 27289161215.

It is an arithmetic number, because the mean of its divisors is an integer number (118253031897).

Almost surely, 2^491204901717 is an apocalyptic number.

It is an amenable number.

491204901717 is a deficient number, since it is larger than the sum of its proper divisors (218313289665).

491204901717 is a wasteful number, since it uses less digits than its factorization.

491204901717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54578322419 (or 54578322416 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The spelling of 491204901717 in words is "four hundred ninety-one billion, two hundred four million, nine hundred one thousand, seven hundred seventeen".