91819182787 has 2 divisors, whose sum is σ = 91819182788. Its totient is φ = 91819182786.

The previous prime is 91819182731. The next prime is 91819182827. The reversal of 91819182787 is 78728191819.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91819182787 is a prime.

It is not a weakly prime, because it can be changed into another prime (91819102787) 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, 45909591393 + 45909591394.

It is an arithmetic number, because the mean of its divisors is an integer number (45909591394).

Almost surely, 2^91819182787 is an apocalyptic number.

91819182787 is a deficient number, since it is larger than the sum of its proper divisors (1).

91819182787 is an equidigital number, since it uses as much as digits as its factorization.

91819182787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 61.

The spelling of 91819182787 in words is "ninety-one billion, eight hundred nineteen million, one hundred eighty-two thousand, seven hundred eighty-seven".