91859730811 has 2 divisors, whose sum is σ = 91859730812. Its totient is φ = 91859730810.

The previous prime is 91859730761. The next prime is 91859730827. The reversal of 91859730811 is 11803795819.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91859730811 is a prime.

It is not a weakly prime, because it can be changed into another prime (91859733811) 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, 45929865405 + 45929865406.

It is an arithmetic number, because the mean of its divisors is an integer number (45929865406).

Almost surely, 2^91859730811 is an apocalyptic number.

91859730811 is a deficient number, since it is larger than the sum of its proper divisors (1).

91859730811 is an equidigital number, since it uses as much as digits as its factorization.

91859730811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 52.

The spelling of 91859730811 in words is "ninety-one billion, eight hundred fifty-nine million, seven hundred thirty thousand, eight hundred eleven".