1287639103 has 2 divisors, whose sum is σ = 1287639104. Its totient is φ = 1287639102.

The previous prime is 1287639097. The next prime is 1287639137. The reversal of 1287639103 is 3019367821.

It is a weak prime.

It is an emirp because it is prime and its reverse (3019367821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1287639103 - 2¹⁷ = 1287508031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287639163) 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, 643819551 + 643819552.

It is an arithmetic number, because the mean of its divisors is an integer number (643819552).

Almost surely, 2^1287639103 is an apocalyptic number.

1287639103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287639103 is an equidigital number, since it uses as much as digits as its factorization.

1287639103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 1287639103 is about 35883.6885367154. The cubic root of 1287639103 is about 1087.9227342833.

The spelling of 1287639103 in words is "one billion, two hundred eighty-seven million, six hundred thirty-nine thousand, one hundred three".