1287906017 has 2 divisors, whose sum is σ = 1287906018. Its totient is φ = 1287906016.

The previous prime is 1287906001. The next prime is 1287906019. The reversal of 1287906017 is 7106097821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 823460416 + 464445601 = 28696^2 + 21551^2 .

It is an emirp because it is prime and its reverse (7106097821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1287906017 - 2⁴ = 1287906001 is a prime.

Together with 1287906019, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1287906019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643953008 + 643953009.

It is an arithmetic number, because the mean of its divisors is an integer number (643953009).

Almost surely, 2^1287906017 is an apocalyptic number.

It is an amenable number.

1287906017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287906017 is an equidigital number, since it uses as much as digits as its factorization.

1287906017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 1287906017 is about 35887.4074990100. The cubic root of 1287906017 is about 1087.9979007245.

The spelling of 1287906017 in words is "one billion, two hundred eighty-seven million, nine hundred six thousand, seventeen".