1161121 has 4 divisors (see below), whose sum is σ = 1250452. Its totient is φ = 1071792.

The previous prime is 1161113. The next prime is 1161137. The reversal of 1161121 is 1211611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 314721 + 846400 = 561^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161121 - 2³ = 1161113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 89317 = 1161121 / (1 + 1 + 6 + 1 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161101) 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 3 ways as a sum of consecutive naturals, for example, 44646 + ... + 44671.

It is an arithmetic number, because the mean of its divisors is an integer number (312613).

2^1161121 is an apocalyptic number.

It is an amenable number.

1161121 is a deficient number, since it is larger than the sum of its proper divisors (89331).

1161121 is an equidigital number, since it uses as much as digits as its factorization.

1161121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89330.

The product of its digits is 12, while the sum is 13.

The square root of 1161121 is about 1077.5532469442. The cubic root of 1161121 is about 105.1055929437.

Adding to 1161121 its reverse (1211611), we get a palindrome (2372732).

The spelling of 1161121 in words is "one million, one hundred sixty-one thousand, one hundred twenty-one".