491601197 has 2 divisors, whose sum is σ = 491601198. Its totient is φ = 491601196.

The previous prime is 491601179. The next prime is 491601221. The reversal of 491601197 is 791106194.

Together with previous prime (491601179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 486246601 + 5354596 = 22051^2 + 2314^2 .

It is a cyclic number.

It is not a de Polignac number, because 491601197 - 2¹⁴ = 491584813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491601197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491601107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245800598 + 245800599.

It is an arithmetic number, because the mean of its divisors is an integer number (245800599).

Almost surely, 2^491601197 is an apocalyptic number.

It is an amenable number.

491601197 is a deficient number, since it is larger than the sum of its proper divisors (1).

491601197 is an equidigital number, since it uses as much as digits as its factorization.

491601197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 491601197 is about 22172.0814764875. The cubic root of 491601197 is about 789.2313182120.

The spelling of 491601197 in words is "four hundred ninety-one million, six hundred one thousand, one hundred ninety-seven".