1288734468781 has 2 divisors, whose sum is σ = 1288734468782. Its totient is φ = 1288734468780.

The previous prime is 1288734468733. The next prime is 1288734468851. The reversal of 1288734468781 is 1878644378821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1286058062025 + 2676406756 = 1134045^2 + 51734^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288734468781 - 2¹⁹ = 1288733944493 is a prime.

It is a super-2 number, since 2×1288734468781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1288734468701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644367234390 + 644367234391.

It is an arithmetic number, because the mean of its divisors is an integer number (644367234391).

Almost surely, 2^{1288734468781} is an apocalyptic number.

It is an amenable number.

1288734468781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288734468781 is an equidigital number, since it uses as much as digits as its factorization.

1288734468781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 115605504, while the sum is 67.

The spelling of 1288734468781 in words is "one trillion, two hundred eighty-eight billion, seven hundred thirty-four million, four hundred sixty-eight thousand, seven hundred eighty-one".