491705597 has 2 divisors, whose sum is σ = 491705598. Its totient is φ = 491705596.

The previous prime is 491705581. The next prime is 491705609. The reversal of 491705597 is 795507194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 491686276 + 19321 = 22174^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 491705597 - 2⁴ = 491705581 is a prime.

It is a super-2 number, since 2×491705597² = 483548788242252818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491707597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245852798 + 245852799.

It is an arithmetic number, because the mean of its divisors is an integer number (245852799).

Almost surely, 2^491705597 is an apocalyptic number.

It is an amenable number.

491705597 is a deficient number, since it is larger than the sum of its proper divisors (1).

491705597 is an equidigital number, since it uses as much as digits as its factorization.

491705597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 396900, while the sum is 47.

The square root of 491705597 is about 22174.4356636195. The cubic root of 491705597 is about 789.2871832221.

The spelling of 491705597 in words is "four hundred ninety-one million, seven hundred five thousand, five hundred ninety-seven".