8391651887 has 2 divisors, whose sum is σ = 8391651888. Its totient is φ = 8391651886.

The previous prime is 8391651811. The next prime is 8391651889. The reversal of 8391651887 is 7881561938.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8391651887 - 2¹⁰ = 8391650863 is a prime.

Together with 8391651889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8391651889) 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, 4195825943 + 4195825944.

It is an arithmetic number, because the mean of its divisors is an integer number (4195825944).

Almost surely, 2^8391651887 is an apocalyptic number.

8391651887 is a deficient number, since it is larger than the sum of its proper divisors (1).

8391651887 is an equidigital number, since it uses as much as digits as its factorization.

8391651887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 56.

The square root of 8391651887 is about 91605.9598879898. The cubic root of 8391651887 is about 2032.1190783875.

The spelling of 8391651887 in words is "eight billion, three hundred ninety-one million, six hundred fifty-one thousand, eight hundred eighty-seven".