1269847856969 has 2 divisors, whose sum is σ = 1269847856970. Its totient is φ = 1269847856968.

The previous prime is 1269847856941. The next prime is 1269847856989. The reversal of 1269847856969 is 9696587489621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1268074183744 + 1773673225 = 1126088^2 + 42115^2 .

It is a cyclic number.

It is not a de Polignac number, because 1269847856969 - 2²⁴ = 1269831079753 is a prime.

It is a super-2 number, since 2×1269847856969² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1269847856893 and 1269847856902.

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, 634923928484 + 634923928485.

It is an arithmetic number, because the mean of its divisors is an integer number (634923928485).

Almost surely, 2^{1269847856969} is an apocalyptic number.

It is an amenable number.

1269847856969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1269847856969 is an equidigital number, since it uses as much as digits as its factorization.

1269847856969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2821754880, while the sum is 80.

The spelling of 1269847856969 in words is "one trillion, two hundred sixty-nine billion, eight hundred forty-seven million, eight hundred fifty-six thousand, nine hundred sixty-nine".