91887796907 has 2 divisors, whose sum is σ = 91887796908. Its totient is φ = 91887796906.

The previous prime is 91887796873. The next prime is 91887796919. The reversal of 91887796907 is 70969778819.

It is a strong prime.

It is an emirp because it is prime and its reverse (70969778819) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91887796907 is a prime.

It is not a weakly prime, because it can be changed into another prime (91887796937) 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, 45943898453 + 45943898454.

It is an arithmetic number, because the mean of its divisors is an integer number (45943898454).

Almost surely, 2^91887796907 is an apocalyptic number.

91887796907 is a deficient number, since it is larger than the sum of its proper divisors (1).

91887796907 is an equidigital number, since it uses as much as digits as its factorization.

91887796907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96018048, while the sum is 71.

The spelling of 91887796907 in words is "ninety-one billion, eight hundred eighty-seven million, seven hundred ninety-six thousand, nine hundred seven".