11505231 has 12 divisors (see below), whose sum is σ = 16679208. Its totient is φ = 7642224.

The previous prime is 11505227. The next prime is 11505233. The reversal of 11505231 is 13250511.

It is not a de Polignac number, because 11505231 - 2² = 11505227 is a prime.

It is a super-2 number, since 2×11505231² = 264740680726722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11505233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 456 + ... + 4818.

It is an arithmetic number, because the mean of its divisors is an integer number (1389934).

Almost surely, 2^11505231 is an apocalyptic number.

11505231 is a deficient number, since it is larger than the sum of its proper divisors (5173977).

11505231 is a wasteful number, since it uses less digits than its factorization.

11505231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4662 (or 4659 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 11505231 is about 3391.9361727485. The cubic root of 11505231 is about 225.7520906492.

Adding to 11505231 its reverse (13250511), we get a palindrome (24755742).

The spelling of 11505231 in words is "eleven million, five hundred five thousand, two hundred thirty-one".