491445037169 has 2 divisors, whose sum is σ = 491445037170. Its totient is φ = 491445037168.

The previous prime is 491445037133. The next prime is 491445037229. The reversal of 491445037169 is 961730544194.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304378407025 + 187066630144 = 551705^2 + 432512^2 .

It is a cyclic number.

It is not a de Polignac number, because 491445037169 - 2⁸ = 491445036913 is a prime.

It is a super-2 number, since 2×491445037169² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 491445037169.

It is not a weakly prime, because it can be changed into another prime (491445037129) 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, 245722518584 + 245722518585.

It is an arithmetic number, because the mean of its divisors is an integer number (245722518585).

Almost surely, 2^491445037169 is an apocalyptic number.

It is an amenable number.

491445037169 is a deficient number, since it is larger than the sum of its proper divisors (1).

491445037169 is an equidigital number, since it uses as much as digits as its factorization.

491445037169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 491445037169 in words is "four hundred ninety-one billion, four hundred forty-five million, thirty-seven thousand, one hundred sixty-nine".