11831121 has 6 divisors (see below), whose sum is σ = 17089410. Its totient is φ = 7887408.

The previous prime is 11831117. The next prime is 11831123. The reversal of 11831121 is 12113811.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10112400 + 1718721 = 3180^2 + 1311^2 .

It is not a de Polignac number, because 11831121 - 2² = 11831117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11831094 and 11831103.

It is not an unprimeable number, because it can be changed into a prime (11831123) 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 5 ways as a sum of consecutive naturals, for example, 657276 + ... + 657293.

It is an arithmetic number, because the mean of its divisors is an integer number (2848235).

Almost surely, 2^11831121 is an apocalyptic number.

It is an amenable number.

11831121 is a deficient number, since it is larger than the sum of its proper divisors (5258289).

11831121 is a wasteful number, since it uses less digits than its factorization.

11831121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314575 (or 1314572 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

The square root of 11831121 is about 3439.6396613599. The cubic root of 11831121 is about 227.8637805890.

Adding to 11831121 its reverse (12113811), we get a palindrome (23944932).

It can be divided in two parts, 1183 and 1121, that added together give a square (2304 = 48²).

The spelling of 11831121 in words is "eleven million, eight hundred thirty-one thousand, one hundred twenty-one".