91917783497611 has 2 divisors, whose sum is σ = 91917783497612. Its totient is φ = 91917783497610.

The previous prime is 91917783497587. The next prime is 91917783497621. The reversal of 91917783497611 is 11679438771919.

It is a strong prime.

It is an emirp because it is prime and its reverse (11679438771919) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91917783497611 is a prime.

It is a super-2 number, since 2×91917783497611² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91917783497621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45958891748805 + 45958891748806.

It is an arithmetic number, because the mean of its divisors is an integer number (45958891748806).

Almost surely, 2^{91917783497611} is an apocalyptic number.

91917783497611 is a deficient number, since it is larger than the sum of its proper divisors (1).

91917783497611 is an equidigital number, since it uses as much as digits as its factorization.

91917783497611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144027072, while the sum is 73.

The spelling of 91917783497611 in words is "ninety-one trillion, nine hundred seventeen billion, seven hundred eighty-three million, four hundred ninety-seven thousand, six hundred eleven".