11117081909 has 4 divisors (see below), whose sum is σ = 11190705120. Its totient is φ = 11043458700.

The previous prime is 11117081873. The next prime is 11117081953. The reversal of 11117081909 is 90918071111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11117081909 - 2²⁴ = 11100304693 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 (11117071909) 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, 36811379 + ... + 36811680.

It is an arithmetic number, because the mean of its divisors is an integer number (2797676280).

Almost surely, 2^11117081909 is an apocalyptic number.

It is an amenable number.

11117081909 is a deficient number, since it is larger than the sum of its proper divisors (73623211).

11117081909 is an equidigital number, since it uses as much as digits as its factorization.

11117081909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73623210.

The product of its (nonzero) digits is 4536, while the sum is 38.

The spelling of 11117081909 in words is "eleven billion, one hundred seventeen million, eighty-one thousand, nine hundred nine".