1111001 has 4 divisors (see below), whose sum is σ = 1176372. Its totient is φ = 1045632.

The previous prime is 1110997. The next prime is 1111007. The reversal of 1111001 is 1001111.

1111001 = T₃₅₃ + T₃₅₄ + ... + T₃₆₉.

1111001 = 164² + 165² + ... + 197².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1001111 = 181 ⋅5531.

It can be written as a sum of positive squares in 2 ways, for example, as 931225 + 179776 = 965^2 + 424^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111001 - 2² = 1110997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32660 + ... + 32693.

It is an arithmetic number, because the mean of its divisors is an integer number (294093).

2^1111001 is an apocalyptic number.

It is an amenable number.

1111001 is a deficient number, since it is larger than the sum of its proper divisors (65371).

1111001 is an equidigital number, since it uses as much as digits as its factorization.

1111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65370.

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

The square root of 1111001 is about 1054.0403218094. The cubic root of 1111001 is about 103.5709953439.

Adding to 1111001 its reverse (1001111), we get a palindrome (2112112).

Multiplying 1111001 by its reverse (1001111), we get a palindrome (1112235322111).

It can be divided in two parts, 111 and 1001, that multiplied together give a palindrome (111111).

The spelling of 1111001 in words is "one million, one hundred eleven thousand, one".