3191318987 has 2 divisors, whose sum is σ = 3191318988. Its totient is φ = 3191318986.

The previous prime is 3191318981. The next prime is 3191319011. The reversal of 3191318987 is 7898131913.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3191318987 - 2⁴ = 3191318971 is a prime.

It is not a weakly prime, because it can be changed into another prime (3191318981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1595659493 + 1595659494.

It is an arithmetic number, because the mean of its divisors is an integer number (1595659494).

Almost surely, 2^3191318987 is an apocalyptic number.

3191318987 is a deficient number, since it is larger than the sum of its proper divisors (1).

3191318987 is an equidigital number, since it uses as much as digits as its factorization.

3191318987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 50.

The square root of 3191318987 is about 56491.7603460894. The cubic root of 3191318987 is about 1472.2788457629.

The spelling of 3191318987 in words is "three billion, one hundred ninety-one million, three hundred eighteen thousand, nine hundred eighty-seven".