11701170991 has 2 divisors, whose sum is σ = 11701170992. Its totient is φ = 11701170990.

The previous prime is 11701170989. The next prime is 11701171021. The reversal of 11701170991 is 19907110711.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11701170991 - 2¹ = 11701170989 is a prime.

Together with 11701170989, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 11701170991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11701170911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5850585495 + 5850585496.

It is an arithmetic number, because the mean of its divisors is an integer number (5850585496).

Almost surely, 2^11701170991 is an apocalyptic number.

11701170991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11701170991 is an equidigital number, since it uses as much as digits as its factorization.

11701170991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3969, while the sum is 37.

The spelling of 11701170991 in words is "eleven billion, seven hundred one million, one hundred seventy thousand, nine hundred ninety-one".