87192918497 has 2 divisors, whose sum is σ = 87192918498. Its totient is φ = 87192918496.

The previous prime is 87192918479. The next prime is 87192918517. The reversal of 87192918497 is 79481929178.

Together with previous prime (87192918479) 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., 57442188241 + 29750730256 = 239671^2 + 172484^2 .

It is a cyclic number.

It is not a de Polignac number, because 87192918497 - 2⁶ = 87192918433 is a prime.

It is not a weakly prime, because it can be changed into another prime (87192918697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43596459248 + 43596459249.

It is an arithmetic number, because the mean of its divisors is an integer number (43596459249).

Almost surely, 2^87192918497 is an apocalyptic number.

It is an amenable number.

87192918497 is a deficient number, since it is larger than the sum of its proper divisors (1).

87192918497 is an equidigital number, since it uses as much as digits as its factorization.

87192918497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18289152, while the sum is 65.

The spelling of 87192918497 in words is "eighty-seven billion, one hundred ninety-two million, nine hundred eighteen thousand, four hundred ninety-seven".