11531228 has 6 divisors (see below), whose sum is σ = 20179656. Its totient is φ = 5765612.

The previous prime is 11531207. The next prime is 11531231. The reversal of 11531228 is 82213511.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1441400 + ... + 1441407.

It is an arithmetic number, because the mean of its divisors is an integer number (3363276).

Almost surely, 2^11531228 is an apocalyptic number.

It is an amenable number.

11531228 is a deficient number, since it is larger than the sum of its proper divisors (8648428).

11531228 is a wasteful number, since it uses less digits than its factorization.

11531228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2882811 (or 2882809 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 11531228 is about 3395.7661874752. The cubic root of 11531228 is about 225.9219977764.

Adding to 11531228 its reverse (82213511), we get a palindrome (93744739).

The spelling of 11531228 in words is "eleven million, five hundred thirty-one thousand, two hundred twenty-eight".