1491263288369 has 2 divisors, whose sum is σ = 1491263288370. Its totient is φ = 1491263288368.

The previous prime is 1491263288341. The next prime is 1491263288401. The reversal of 1491263288369 is 9638823621941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1039125390625 + 452137897744 = 1019375^2 + 672412^2 .

It is an emirp because it is prime and its reverse (9638823621941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1491263288369 - 2²⁸ = 1490994852913 is a prime.

It is a super-2 number, since 2×1491263288369² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1491263288869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745631644184 + 745631644185.

It is an arithmetic number, because the mean of its divisors is an integer number (745631644185).

Almost surely, 2^{1491263288369} is an apocalyptic number.

It is an amenable number.

1491263288369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491263288369 is an equidigital number, since it uses as much as digits as its factorization.

1491263288369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26873856, while the sum is 62.

The spelling of 1491263288369 in words is "one trillion, four hundred ninety-one billion, two hundred sixty-three million, two hundred eighty-eight thousand, three hundred sixty-nine".