91513786811 has 2 divisors, whose sum is σ = 91513786812. Its totient is φ = 91513786810.

The previous prime is 91513786807. The next prime is 91513786823. The reversal of 91513786811 is 11868731519.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91513786811 - 2² = 91513786807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91513786811.

It is not a weakly prime, because it can be changed into another prime (91513786891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45756893405 + 45756893406.

It is an arithmetic number, because the mean of its divisors is an integer number (45756893406).

Almost surely, 2^91513786811 is an apocalyptic number.

91513786811 is a deficient number, since it is larger than the sum of its proper divisors (1).

91513786811 is an equidigital number, since it uses as much as digits as its factorization.

91513786811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 50.

The spelling of 91513786811 in words is "ninety-one billion, five hundred thirteen million, seven hundred eighty-six thousand, eight hundred eleven".