1244555511281 has 2 divisors, whose sum is σ = 1244555511282. Its totient is φ = 1244555511280.

The previous prime is 1244555511253. The next prime is 1244555511299. The reversal of 1244555511281 is 1821155554421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1080300390625 + 164255120656 = 1039375^2 + 405284^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244555511281 - 2²² = 1244551316977 is a prime.

It is a super-2 number, since 2×1244555511281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1244555511181) 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, 622277755640 + 622277755641.

It is an arithmetic number, because the mean of its divisors is an integer number (622277755641).

Almost surely, 2^{1244555511281} is an apocalyptic number.

It is an amenable number.

1244555511281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244555511281 is an equidigital number, since it uses as much as digits as its factorization.

1244555511281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320000, while the sum is 44.

The spelling of 1244555511281 in words is "one trillion, two hundred forty-four billion, five hundred fifty-five million, five hundred eleven thousand, two hundred eighty-one".