11001011111001 has 8 divisors (see below), whose sum is σ = 16297794238560. Its totient is φ = 7334007407316.

The previous prime is 11001011110979. The next prime is 11001011111009. The reversal of 11001011111001 is 10011111010011.

It is not a de Polignac number, because 11001011111001 - 2¹¹ = 11001011108953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (11001011111009) 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, 203722427955 + ... + 203722428008.

It is an arithmetic number, because the mean of its divisors is an integer number (2037224279820).

Almost surely, 2^{11001011111001} is an apocalyptic number.

It is an amenable number.

11001011111001 is a deficient number, since it is larger than the sum of its proper divisors (5296783127559).

11001011111001 is an equidigital number, since it uses as much as digits as its factorization.

11001011111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407444855972 (or 407444855966 counting only the distinct ones).

The product of its (nonzero) digits is 1, while the sum is 9.

Adding to 11001011111001 its reverse (10011111010011), we get a palindrome (21012122121012).

The spelling of 11001011111001 in words is "eleven trillion, one billion, eleven million, one hundred eleven thousand, one".