11311121 has 4 divisors (see below), whose sum is σ = 11587044. Its totient is φ = 11035200.

The previous prime is 11311117. The next prime is 11311123. The reversal of 11311121 is 12111311.

It is a happy number.

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 6558721 + 4752400 = 2561^2 + 2180^2 .

It is a cyclic number.

It is not a de Polignac number, because 11311121 - 2² = 11311117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11311123) 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, 137900 + ... + 137981.

It is an arithmetic number, because the mean of its divisors is an integer number (2896761).

Almost surely, 2^11311121 is an apocalyptic number.

It is an amenable number.

11311121 is a deficient number, since it is larger than the sum of its proper divisors (275923).

11311121 is an equidigital number, since it uses as much as digits as its factorization.

11311121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275922.

The product of its digits is 6, while the sum is 11.

The square root of 11311121 is about 3363.2010049951. The cubic root of 11311121 is about 224.4752941961.

Adding to 11311121 its reverse (12111311), we get a palindrome (23422432).

It can be divided in two parts, 11311 and 121, that multiplied together give a palindrome (1368631).

The spelling of 11311121 in words is "eleven million, three hundred eleven thousand, one hundred twenty-one".