1100001 has 16 divisors (see below), whose sum is σ = 1712000. Its totient is φ = 627984.

The previous prime is 1099997. The next prime is 1100009. The reversal of 1100001 is 1000011.

It is not a de Polignac number, because 1100001 - 2² = 1099997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1100009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 495 + ... + 1563.

It is an arithmetic number, because the mean of its divisors is an integer number (107000).

2^1100001 is an apocalyptic number.

It is an amenable number.

1100001 is a deficient number, since it is larger than the sum of its proper divisors (611999).

1100001 is an equidigital number, since it uses as much as digits as its factorization.

1100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093 (or 1079 counting only the distinct ones).

The product of its (nonzero) digits is 1, while the sum is 3.

The square root of 1100001 is about 1048.8093249013. The cubic root of 1100001 is about 103.2280428268.

Adding to 1100001 its reverse (1000011), we get a palindrome (2100012).

Multiplying 1100001 by its reverse (1000011), we get a palindrome (1100013100011).

The spelling of 1100001 in words is "one million, one hundred thousand, one".