1226280710981 has 2 divisors, whose sum is σ = 1226280710982. Its totient is φ = 1226280710980.

The previous prime is 1226280710917. The next prime is 1226280711001. The reversal of 1226280710981 is 1890170826221.

It is an alternating factorial (1226280710981 = 15! - 14! + 13! - 12! + 11! - 10! + 9! - 8! + 7! - 6! + 5! - 4! + 3! - 2! + 1!).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 811855060900 + 414425650081 = 901030^2 + 643759^2 .

It is a cyclic number.

It is not a de Polignac number, because 1226280710981 - 2⁶ = 1226280710917 is a prime.

It is a super-2 number, since 2×1226280710981² (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 (1226280710581) 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, 613140355490 + 613140355491.

It is an arithmetic number, because the mean of its divisors is an integer number (613140355491).

Almost surely, 2^{1226280710981} is an apocalyptic number.

It is an amenable number.

1226280710981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226280710981 is an equidigital number, since it uses as much as digits as its factorization.

1226280710981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 47.

The spelling of 1226280710981 in words is "one trillion, two hundred twenty-six billion, two hundred eighty million, seven hundred ten thousand, nine hundred eighty-one".