491481389149 has 2 divisors, whose sum is σ = 491481389150. Its totient is φ = 491481389148.

The previous prime is 491481389117. The next prime is 491481389197. The reversal of 491481389149 is 941983184194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 468773008900 + 22708380249 = 684670^2 + 150693^2 .

It is a cyclic number.

It is not a de Polignac number, because 491481389149 - 2⁵ = 491481389117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491481389249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245740694574 + 245740694575.

It is an arithmetic number, because the mean of its divisors is an integer number (245740694575).

Almost surely, 2^491481389149 is an apocalyptic number.

It is an amenable number.

491481389149 is a deficient number, since it is larger than the sum of its proper divisors (1).

491481389149 is an equidigital number, since it uses as much as digits as its factorization.

491481389149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8957952, while the sum is 61.

The spelling of 491481389149 in words is "four hundred ninety-one billion, four hundred eighty-one million, three hundred eighty-nine thousand, one hundred forty-nine".