1271646653 has 2 divisors, whose sum is σ = 1271646654. Its totient is φ = 1271646652.

The previous prime is 1271646637. The next prime is 1271646683. The reversal of 1271646653 is 3566461721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1034394244 + 237252409 = 32162^2 + 15403^2 .

It is a cyclic number.

It is not a de Polignac number, because 1271646653 - 2⁴ = 1271646637 is a prime.

It is a super-2 number, since 2×1271646653² = 3234170420172204818, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1271646653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1271646683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635823326 + 635823327.

It is an arithmetic number, because the mean of its divisors is an integer number (635823327).

Almost surely, 2^1271646653 is an apocalyptic number.

It is an amenable number.

1271646653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271646653 is an equidigital number, since it uses as much as digits as its factorization.

1271646653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 41.

The square root of 1271646653 is about 35660.1549772291. The cubic root of 1271646653 is about 1083.3999657214.

The spelling of 1271646653 in words is "one billion, two hundred seventy-one million, six hundred forty-six thousand, six hundred fifty-three".