97687488395891 has 2 divisors, whose sum is σ = 97687488395892. Its totient is φ = 97687488395890.

The previous prime is 97687488395881. The next prime is 97687488395941. The reversal of 97687488395891 is 19859388478679.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97687488395891 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97687488395891.

It is not a weakly prime, because it can be changed into another prime (97687488395881) 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, 48843744197945 + 48843744197946.

It is an arithmetic number, because the mean of its divisors is an integer number (48843744197946).

Almost surely, 2^{97687488395891} is an apocalyptic number.

97687488395891 is a deficient number, since it is larger than the sum of its proper divisors (1).

97687488395891 is an equidigital number, since it uses as much as digits as its factorization.

97687488395891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52672757760, while the sum is 92.

The spelling of 97687488395891 in words is "ninety-seven trillion, six hundred eighty-seven billion, four hundred eighty-eight million, three hundred ninety-five thousand, eight hundred ninety-one".