1260120509 has 2 divisors, whose sum is σ = 1260120510. Its totient is φ = 1260120508.

The previous prime is 1260120469. The next prime is 1260120539. The reversal of 1260120509 is 9050210621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 707400409 + 552720100 = 26597^2 + 23510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1260120509 - 2²⁸ = 991685053 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1260120539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630060254 + 630060255.

It is an arithmetic number, because the mean of its divisors is an integer number (630060255).

Almost surely, 2^1260120509 is an apocalyptic number.

It is an amenable number.

1260120509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1260120509 is an equidigital number, since it uses as much as digits as its factorization.

1260120509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1260120509 is about 35498.1761362468. The cubic root of 1260120509 is about 1080.1167309242.

The spelling of 1260120509 in words is "one billion, two hundred sixty million, one hundred twenty thousand, five hundred nine".