11117097991 has 4 divisors (see below), whose sum is σ = 11130606832. Its totient is φ = 11103589152.

The previous prime is 11117097973. The next prime is 11117098019. The reversal of 11117097991 is 19979071111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11117097991 - 2¹¹ = 11117095943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11117097941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6753186 + ... + 6754831.

It is an arithmetic number, because the mean of its divisors is an integer number (2782651708).

Almost surely, 2^11117097991 is an apocalyptic number.

11117097991 is a deficient number, since it is larger than the sum of its proper divisors (13508841).

11117097991 is an equidigital number, since it uses as much as digits as its factorization.

11117097991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13508840.

The product of its (nonzero) digits is 35721, while the sum is 46.

The spelling of 11117097991 in words is "eleven billion, one hundred seventeen million, ninety-seven thousand, nine hundred ninety-one".