1287142529 has 2 divisors, whose sum is σ = 1287142530. Its totient is φ = 1287142528.

The previous prime is 1287142511. The next prime is 1287142543. The reversal of 1287142529 is 9252417821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1286872129 + 270400 = 35873^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287142529 - 2²⁸ = 1018707073 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 (1287142559) 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, 643571264 + 643571265.

It is an arithmetic number, because the mean of its divisors is an integer number (643571265).

Almost surely, 2^1287142529 is an apocalyptic number.

It is an amenable number.

1287142529 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287142529 is an equidigital number, since it uses as much as digits as its factorization.

1287142529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 41.

The square root of 1287142529 is about 35876.7686532664. The cubic root of 1287142529 is about 1087.7828649664.

The spelling of 1287142529 in words is "one billion, two hundred eighty-seven million, one hundred forty-two thousand, five hundred twenty-nine".