491017097 has 2 divisors, whose sum is σ = 491017098. Its totient is φ = 491017096.

The previous prime is 491017073. The next prime is 491017099. The reversal of 491017097 is 790710194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 339333241 + 151683856 = 18421^2 + 12316^2 .

It is a cyclic number.

It is not a de Polignac number, because 491017097 - 2²² = 486822793 is a prime.

Together with 491017099, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491017097.

It is not a weakly prime, because it can be changed into another prime (491017099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245508548 + 245508549.

It is an arithmetic number, because the mean of its divisors is an integer number (245508549).

Almost surely, 2^491017097 is an apocalyptic number.

It is an amenable number.

491017097 is a deficient number, since it is larger than the sum of its proper divisors (1).

491017097 is an equidigital number, since it uses as much as digits as its factorization.

491017097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 491017097 is about 22158.9055912064. The cubic root of 491017097 is about 788.9186171088.

The spelling of 491017097 in words is "four hundred ninety-one million, seventeen thousand, ninety-seven".