11001101001001 has 2 divisors, whose sum is σ = 11001101001002. Its totient is φ = 11001101001000.

The previous prime is 11001101000999. The next prime is 11001101001013. The reversal of 11001101001001 is 10010010110011.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10409986055401 + 591114945600 = 3226451^2 + 768840^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001101001001 - 2¹ = 11001101000999 is a prime.

Together with 11001101000999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11001101001091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5500550500500 + 5500550500501.

It is an arithmetic number, because the mean of its divisors is an integer number (5500550500501).

Almost surely, 2^{11001101001001} is an apocalyptic number.

It is an amenable number.

11001101001001 is a deficient number, since it is larger than the sum of its proper divisors (1).

11001101001001 is an equidigital number, since it uses as much as digits as its factorization.

11001101001001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1, while the sum is 7.

Adding to 11001101001001 its reverse (10010010110011), we get a palindrome (21011111111012).

The spelling of 11001101001001 in words is "eleven trillion, one billion, one hundred one million, one thousand, one".