11111001010001 has 4 divisors (see below), whose sum is σ = 11293148567604. Its totient is φ = 10928853452400.

The previous prime is 11111001009943. The next prime is 11111001010007. The reversal of 11111001010001 is 10001010011111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3323128473025 + 7787872536976 = 1822945^2 + 2790676^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11111001010001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11111001010007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91073778710 + ... + 91073778831.

It is an arithmetic number, because the mean of its divisors is an integer number (2823287141901).

Almost surely, 2^{11111001010001} is an apocalyptic number.

It is an amenable number.

11111001010001 is a deficient number, since it is larger than the sum of its proper divisors (182147557603).

11111001010001 is an equidigital number, since it uses as much as digits as its factorization.

11111001010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182147557602.

The product of its (nonzero) digits is 1, while the sum is 8.

Adding to 11111001010001 its reverse (10001010011111), we get a palindrome (21112011021112).

The spelling of 11111001010001 in words is "eleven trillion, one hundred eleven billion, one million, ten thousand, one".