1290955009 has 2 divisors, whose sum is σ = 1290955010. Its totient is φ = 1290955008.

The previous prime is 1290954991. The next prime is 1290955013. The reversal of 1290955009 is 9005590921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 898320784 + 392634225 = 29972^2 + 19815^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290955009 - 2⁷ = 1290954881 is a prime.

It is not a weakly prime, because it can be changed into another prime (1290955409) 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, 645477504 + 645477505.

It is an arithmetic number, because the mean of its divisors is an integer number (645477505).

Almost surely, 2^1290955009 is an apocalyptic number.

It is an amenable number.

1290955009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290955009 is an equidigital number, since it uses as much as digits as its factorization.

1290955009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36450, while the sum is 40.

The square root of 1290955009 is about 35929.8623570979. The cubic root of 1290955009 is about 1088.8558004203.

The spelling of 1290955009 in words is "one billion, two hundred ninety million, nine hundred fifty-five thousand, nine".