1287916543 has 2 divisors, whose sum is σ = 1287916544. Its totient is φ = 1287916542.

The previous prime is 1287916537. The next prime is 1287916571. The reversal of 1287916543 is 3456197821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1287916543 - 2²⁵ = 1254362111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1287916493 and 1287916502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287911543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643958271 + 643958272.

It is an arithmetic number, because the mean of its divisors is an integer number (643958272).

Almost surely, 2^1287916543 is an apocalyptic number.

1287916543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287916543 is an equidigital number, since it uses as much as digits as its factorization.

1287916543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 46.

The square root of 1287916543 is about 35887.5541518226. The cubic root of 1287916543 is about 1088.0008647696. Note that the first 3 decimals are identical.

The spelling of 1287916543 in words is "one billion, two hundred eighty-seven million, nine hundred sixteen thousand, five hundred forty-three".