11111001243 has 4 divisors (see below), whose sum is σ = 14814668328. Its totient is φ = 7407334160.

The previous prime is 11111001233. The next prime is 11111001257. The reversal of 11111001243 is 34210011111.

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 11111001243 - 2⁴ = 11111001227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11111001233) 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, 1851833538 + ... + 1851833543.

It is an arithmetic number, because the mean of its divisors is an integer number (3703667082).

Almost surely, 2^11111001243 is an apocalyptic number.

11111001243 is a deficient number, since it is larger than the sum of its proper divisors (3703667085).

11111001243 is an equidigital number, since it uses as much as digits as its factorization.

11111001243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703667084.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 11111001243 its reverse (34210011111), we get a palindrome (45321012354).

The spelling of 11111001243 in words is "eleven billion, one hundred eleven million, one thousand, two hundred forty-three".