87317142142991 has 2 divisors, whose sum is σ = 87317142142992. Its totient is φ = 87317142142990.

The previous prime is 87317142142963. The next prime is 87317142142999. The reversal of 87317142142991 is 19924124171378.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87317142142991 - 2¹⁸ = 87317141880847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87317142142991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87317142142999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43658571071495 + 43658571071496.

It is an arithmetic number, because the mean of its divisors is an integer number (43658571071496).

Almost surely, 2^{87317142142991} is an apocalyptic number.

87317142142991 is a deficient number, since it is larger than the sum of its proper divisors (1).

87317142142991 is an equidigital number, since it uses as much as digits as its factorization.

87317142142991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6096384, while the sum is 59.

The spelling of 87317142142991 in words is "eighty-seven trillion, three hundred seventeen billion, one hundred forty-two million, one hundred forty-two thousand, nine hundred ninety-one".