1309863887 has 2 divisors, whose sum is σ = 1309863888. Its totient is φ = 1309863886.

The previous prime is 1309863881. The next prime is 1309863931. The reversal of 1309863887 is 7883689031.

It is a weak prime.

It is an emirp because it is prime and its reverse (7883689031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1309863887 - 2⁴ = 1309863871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1309863881) 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, 654931943 + 654931944.

It is an arithmetic number, because the mean of its divisors is an integer number (654931944).

Almost surely, 2^1309863887 is an apocalyptic number.

1309863887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1309863887 is an equidigital number, since it uses as much as digits as its factorization.

1309863887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 1309863887 is about 36192.0417633490. The cubic root of 1309863887 is about 1094.1462836918.

The spelling of 1309863887 in words is "one billion, three hundred nine million, eight hundred sixty-three thousand, eight hundred eighty-seven".