1275644609 has 2 divisors, whose sum is σ = 1275644610. Its totient is φ = 1275644608.

The previous prime is 1275644567. The next prime is 1275644611. The reversal of 1275644609 is 9064465721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 939729025 + 335915584 = 30655^2 + 18328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1275644609 is a prime.

Together with 1275644611, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1275644609.

It is not a weakly prime, because it can be changed into another prime (1275644659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637822304 + 637822305.

It is an arithmetic number, because the mean of its divisors is an integer number (637822305).

Almost surely, 2^1275644609 is an apocalyptic number.

It is an amenable number.

1275644609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275644609 is an equidigital number, since it uses as much as digits as its factorization.

1275644609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 1275644609 is about 35716.1673335760. The cubic root of 1275644609 is about 1084.5341524123.

The spelling of 1275644609 in words is "one billion, two hundred seventy-five million, six hundred forty-four thousand, six hundred nine".