1244321278261 has 2 divisors, whose sum is σ = 1244321278262. Its totient is φ = 1244321278260.

The previous prime is 1244321278247. The next prime is 1244321278279. The reversal of 1244321278261 is 1628721234421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 946826302500 + 297494975761 = 973050^2 + 545431^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244321278261 - 2⁷ = 1244321278133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1244321278241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622160639130 + 622160639131.

It is an arithmetic number, because the mean of its divisors is an integer number (622160639131).

Almost surely, 2^{1244321278261} is an apocalyptic number.

It is an amenable number.

1244321278261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244321278261 is an equidigital number, since it uses as much as digits as its factorization.

1244321278261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 43.

The spelling of 1244321278261 in words is "one trillion, two hundred forty-four billion, three hundred twenty-one million, two hundred seventy-eight thousand, two hundred sixty-one".