1277969009 has 2 divisors, whose sum is σ = 1277969010. Its totient is φ = 1277969008.

The previous prime is 1277968997. The next prime is 1277969023. The reversal of 1277969009 is 9009697721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1014231409 + 263737600 = 31847^2 + 16240^2 .

It is a cyclic number.

It is not a de Polignac number, because 1277969009 - 2⁸ = 1277968753 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 (1277969029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638984504 + 638984505.

It is an arithmetic number, because the mean of its divisors is an integer number (638984505).

Almost surely, 2^1277969009 is an apocalyptic number.

It is an amenable number.

1277969009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277969009 is an equidigital number, since it uses as much as digits as its factorization.

1277969009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 428652, while the sum is 50.

The square root of 1277969009 is about 35748.6924096533. The cubic root of 1277969009 is about 1085.1924762059.

The spelling of 1277969009 in words is "one billion, two hundred seventy-seven million, nine hundred sixty-nine thousand, nine".