1121121 has 10 divisors (see below), whose sum is σ = 1674882. Its totient is φ = 747360.

The previous prime is 1121101. The next prime is 1121143. The reversal of 1121121 is 1211211.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 876096 + 245025 = 936^2 + 495^2 .

It is not a de Polignac number, because 1121121 - 2⁷ = 1120993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

1121121 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121101) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6840 + ... + 7001.

2^1121121 is an apocalyptic number.

It is an amenable number.

1121121 is a deficient number, since it is larger than the sum of its proper divisors (553761).

1121121 is an equidigital number, since it uses as much as digits as its factorization.

1121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13853 (or 13844 counting only the distinct ones).

The product of its digits is 4, while the sum is 9.

The square root of 1121121 is about 1058.8300146860. The cubic root of 1121121 is about 103.8845180190.

Adding to 1121121 its reverse (1211211), we get a palindrome (2332332).

The spelling of 1121121 in words is "one million, one hundred twenty-one thousand, one hundred twenty-one".