11031231 has 4 divisors (see below), whose sum is σ = 14708312. Its totient is φ = 7354152.

The previous prime is 11031221. The next prime is 11031239. The reversal of 11031231 is 13213011.

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

It is a de Polignac number, because none of the positive numbers 2^k-11031231 is a prime.

It is a super-2 number, since 2×11031231² = 243376114750722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11031239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1838536 + ... + 1838541.

It is an arithmetic number, because the mean of its divisors is an integer number (3677078).

Almost surely, 2^11031231 is an apocalyptic number.

11031231 is a deficient number, since it is larger than the sum of its proper divisors (3677081).

11031231 is an equidigital number, since it uses as much as digits as its factorization.

11031231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3677080.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 11031231 is about 3321.3297035976. The cubic root of 11031231 is about 222.6082863051.

Adding to 11031231 its reverse (13213011), we get a palindrome (24244242).

The spelling of 11031231 in words is "eleven million, thirty-one thousand, two hundred thirty-one".