1275921329 has 2 divisors, whose sum is σ = 1275921330. Its totient is φ = 1275921328.

The previous prime is 1275921319. The next prime is 1275921331. The reversal of 1275921329 is 9231295721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1239040000 + 36881329 = 35200^2 + 6073^2 .

It is a cyclic number.

It is not a de Polignac number, because 1275921329 - 2²⁸ = 1007485873 is a prime.

It is a Sophie Germain prime.

Together with 1275921331, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1275921319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637960664 + 637960665.

It is an arithmetic number, because the mean of its divisors is an integer number (637960665).

Almost surely, 2^1275921329 is an apocalyptic number.

It is an amenable number.

1275921329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275921329 is an equidigital number, since it uses as much as digits as its factorization.

1275921329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 41.

The square root of 1275921329 is about 35720.0409994166. The cubic root of 1275921329 is about 1084.6125678242.

The spelling of 1275921329 in words is "one billion, two hundred seventy-five million, nine hundred twenty-one thousand, three hundred twenty-nine".