11101001 has 8 divisors (see below), whose sum is σ = 11383680. Its totient is φ = 10822032.

The previous prime is 11100989. The next prime is 11101033. The reversal of 11101001 is 10010111.

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

It is a cyclic number.

It is not a de Polignac number, because 11101001 - 2⁶ = 11100937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11101061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5711 + ... + 7403.

It is an arithmetic number, because the mean of its divisors is an integer number (1422960).

Almost surely, 2^11101001 is an apocalyptic number.

It is an amenable number.

11101001 is a deficient number, since it is larger than the sum of its proper divisors (282679).

11101001 is an equidigital number, since it uses as much as digits as its factorization.

11101001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855.

The product of its (nonzero) digits is 1, while the sum is 5.

The square root of 11101001 is about 3331.8164715362. The cubic root of 11101001 is about 223.0766157409.

Adding to 11101001 its reverse (10010111), we get a palindrome (21111112).

Multiplying 11101001 by its reverse (10010111), we get a palindrome (111122252221111).

The spelling of 11101001 in words is "eleven million, one hundred one thousand, one".