1244609888261 has 2 divisors, whose sum is σ = 1244609888262. Its totient is φ = 1244609888260.

The previous prime is 1244609888227. The next prime is 1244609888321. The reversal of 1244609888261 is 1628889064421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 985522780225 + 259087108036 = 992735^2 + 509006^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244609888261 - 2¹⁰ = 1244609887237 is a prime.

It is a super-3 number, since 3×1244609888261³ (a number of 37 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1244609888261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1244609288261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622304944130 + 622304944131.

It is an arithmetic number, because the mean of its divisors is an integer number (622304944131).

Almost surely, 2^{1244609888261} is an apocalyptic number.

It is an amenable number.

1244609888261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244609888261 is an equidigital number, since it uses as much as digits as its factorization.

1244609888261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10616832, while the sum is 59.

The spelling of 1244609888261 in words is "one trillion, two hundred forty-four billion, six hundred nine million, eight hundred eighty-eight thousand, two hundred sixty-one".