11099657891 has 4 divisors (see below), whose sum is σ = 12685323312. Its totient is φ = 9513992472.

The previous prime is 11099657869. The next prime is 11099657909. The reversal of 11099657891 is 19875699011.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11099657891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11099657831) 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, 792832700 + ... + 792832713.

It is an arithmetic number, because the mean of its divisors is an integer number (3171330828).

Almost surely, 2^11099657891 is an apocalyptic number.

11099657891 is a deficient number, since it is larger than the sum of its proper divisors (1585665421).

11099657891 is an equidigital number, since it uses as much as digits as its factorization.

11099657891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585665420.

The product of its (nonzero) digits is 1224720, while the sum is 56.

The spelling of 11099657891 in words is "eleven billion, ninety-nine million, six hundred fifty-seven thousand, eight hundred ninety-one".