11111001111001 has 8 divisors (see below), whose sum is σ = 12127468310208. Its totient is φ = 10095596610000.

The previous prime is 11111001110971. The next prime is 11111001111019. The reversal of 11111001111001 is 10011110011111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11111001111001 - 2⁵ = 11111001110969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111001111061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265652685 + ... + 265694506.

It is an arithmetic number, because the mean of its divisors is an integer number (1515933538776).

Almost surely, 2^{11111001111001} is an apocalyptic number.

11111001111001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11111001111001 is a deficient number, since it is larger than the sum of its proper divisors (1016467199207).

11111001111001 is a wasteful number, since it uses less digits than its factorization.

11111001111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531349103.

The product of its (nonzero) digits is 1, while the sum is 10.

Adding to 11111001111001 its reverse (10011110011111), we get a palindrome (21122111122112).

It can be divided in two parts, 1111 and 1001111001, that multiplied together give a palindrome (1112234322111).

The spelling of 11111001111001 in words is "eleven trillion, one hundred eleven billion, one million, one hundred eleven thousand, one".