1275706249 has 2 divisors, whose sum is σ = 1275706250. Its totient is φ = 1275706248.

The previous prime is 1275706199. The next prime is 1275706253. The reversal of 1275706249 is 9426075721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 770895225 + 504811024 = 27765^2 + 22468^2 .

It is an emirp because it is prime and its reverse (9426075721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1275706249 - 2⁷ = 1275706121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1275706279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637853124 + 637853125.

It is an arithmetic number, because the mean of its divisors is an integer number (637853125).

Almost surely, 2^1275706249 is an apocalyptic number.

It is an amenable number.

1275706249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275706249 is an equidigital number, since it uses as much as digits as its factorization.

1275706249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 1275706249 is about 35717.0302376891. The cubic root of 1275706249 is about 1084.5516206026.

The spelling of 1275706249 in words is "one billion, two hundred seventy-five million, seven hundred six thousand, two hundred forty-nine".