11001001 has 8 divisors (see below), whose sum is σ = 12388608. Its totient is φ = 9678000.

The previous prime is 11000993. The next prime is 11001007. The reversal of 11001001 is 10010011.

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 11001001 - 2³ = 11000993 is a prime.

It is a Duffinian number.

11001001 is a modest number, since divided by 1001 gives 11 as remainder.

It is not an unprimeable number, because it can be changed into a prime (11001007) 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, 15790 + ... + 16471.

It is an arithmetic number, because the mean of its divisors is an integer number (1548576).

Almost surely, 2^11001001 is an apocalyptic number.

11001001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11001001 is a deficient number, since it is larger than the sum of its proper divisors (1387607).

11001001 is a wasteful number, since it uses less digits than its factorization.

11001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32303.

The product of its (nonzero) digits is 1, while the sum is 4.

The square root of 11001001 is about 3316.7756933504. The cubic root of 11001001 is about 222.4047549253.

Adding to 11001001 its reverse (10010011), we get a palindrome (21011012).

Multiplying 11001001 by its reverse (10010011), we get a palindrome (110120141021011).

The spelling of 11001001 in words is "eleven million, one thousand, one".