1275628657 has 2 divisors, whose sum is σ = 1275628658. Its totient is φ = 1275628656.

The previous prime is 1275628621. The next prime is 1275628681. The reversal of 1275628657 is 7568265721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 859427856 + 416200801 = 29316^2 + 20401^2 .

It is an emirp because it is prime and its reverse (7568265721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1275628657 - 2¹¹ = 1275626609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1275628657.

It is not a weakly prime, because it can be changed into another prime (1275628957) 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, 637814328 + 637814329.

It is an arithmetic number, because the mean of its divisors is an integer number (637814329).

Almost surely, 2^1275628657 is an apocalyptic number.

It is an amenable number.

1275628657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275628657 is an equidigital number, since it uses as much as digits as its factorization.

1275628657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1411200, while the sum is 49.

The square root of 1275628657 is about 35715.9440166433. The cubic root of 1275628657 is about 1084.5296316754.

The spelling of 1275628657 in words is "one billion, two hundred seventy-five million, six hundred twenty-eight thousand, six hundred fifty-seven".