1275730409 has 2 divisors, whose sum is σ = 1275730410. Its totient is φ = 1275730408.

The previous prime is 1275730381. The next prime is 1275730429. The reversal of 1275730409 is 9040375721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1251178384 + 24552025 = 35372^2 + 4955^2 .

It is a cyclic number.

It is not a de Polignac number, because 1275730409 - 2⁸ = 1275730153 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1275730429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637865204 + 637865205.

It is an arithmetic number, because the mean of its divisors is an integer number (637865205).

Almost surely, 2^1275730409 is an apocalyptic number.

It is an amenable number.

1275730409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275730409 is an equidigital number, since it uses as much as digits as its factorization.

1275730409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 1275730409 is about 35717.3684500972. The cubic root of 1275730409 is about 1084.5584671635.

The spelling of 1275730409 in words is "one billion, two hundred seventy-five million, seven hundred thirty thousand, four hundred nine".