1287732713 has 2 divisors, whose sum is σ = 1287732714. Its totient is φ = 1287732712.

The previous prime is 1287732709. The next prime is 1287732731. The reversal of 1287732713 is 3172377821.

It is a happy number.

Together with next prime (1287732731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 724524889 + 563207824 = 26917^2 + 23732^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287732713 - 2² = 1287732709 is a prime.

It is not a weakly prime, because it can be changed into another prime (1287732703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643866356 + 643866357.

It is an arithmetic number, because the mean of its divisors is an integer number (643866357).

Almost surely, 2^1287732713 is an apocalyptic number.

It is an amenable number.

1287732713 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287732713 is an equidigital number, since it uses as much as digits as its factorization.

1287732713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 41.

The square root of 1287732713 is about 35884.9928660993. The cubic root of 1287732713 is about 1087.9490972549.

The spelling of 1287732713 in words is "one billion, two hundred eighty-seven million, seven hundred thirty-two thousand, seven hundred thirteen".