491586197 has 2 divisors, whose sum is σ = 491586198. Its totient is φ = 491586196.

The previous prime is 491586157. The next prime is 491586209. The reversal of 491586197 is 791685194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 467683876 + 23902321 = 21626^2 + 4889^2 .

It is a cyclic number.

It is not a de Polignac number, because 491586197 - 2⁶ = 491586133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491586157) 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, 245793098 + 245793099.

It is an arithmetic number, because the mean of its divisors is an integer number (245793099).

Almost surely, 2^491586197 is an apocalyptic number.

It is an amenable number.

491586197 is a deficient number, since it is larger than the sum of its proper divisors (1).

491586197 is an equidigital number, since it uses as much as digits as its factorization.

491586197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 50.

The square root of 491586197 is about 22171.7432106725. The cubic root of 491586197 is about 789.2232909802.

It can be divided in two parts, 49158 and 6197, that added together give a palindrome (55355).

The spelling of 491586197 in words is "four hundred ninety-one million, five hundred eighty-six thousand, one hundred ninety-seven".