1269847856989 has 2 divisors, whose sum is σ = 1269847856990. Its totient is φ = 1269847856988.

The previous prime is 1269847856969. The next prime is 1269847856999. The reversal of 1269847856989 is 9896587489621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1044657747225 + 225190109764 = 1022085^2 + 474542^2 .

It is a cyclic number.

It is not a de Polignac number, because 1269847856989 - 2⁷ = 1269847856861 is a prime.

It is a super-3 number, since 3×1269847856989³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1269847856929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634923928494 + 634923928495.

It is an arithmetic number, because the mean of its divisors is an integer number (634923928495).

Almost surely, 2^{1269847856989} is an apocalyptic number.

It is an amenable number.

1269847856989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1269847856989 is an equidigital number, since it uses as much as digits as its factorization.

1269847856989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3762339840, while the sum is 82.

The spelling of 1269847856989 in words is "one trillion, two hundred sixty-nine billion, eight hundred forty-seven million, eight hundred fifty-six thousand, nine hundred eighty-nine".