1111211231 has 4 divisors (see below), whose sum is σ = 1196689032. Its totient is φ = 1025733432.

The previous prime is 1111211209. The next prime is 1111211243. The reversal of 1111211231 is 1321121111.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111211231 is a prime.

It is a super-2 number, since 2×1111211231² = 2469580799801070722, 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 (1111213231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42738881 + ... + 42738906.

It is an arithmetic number, because the mean of its divisors is an integer number (299172258).

Almost surely, 2^1111211231 is an apocalyptic number.

1111211231 is a deficient number, since it is larger than the sum of its proper divisors (85477801).

1111211231 is an equidigital number, since it uses as much as digits as its factorization.

1111211231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85477800.

The product of its digits is 12, while the sum is 14.

The square root of 1111211231 is about 33334.8350978372. The cubic root of 1111211231 is about 1035.7752772943.

Adding to 1111211231 its reverse (1321121111), we get a palindrome (2432332342).

The spelling of 1111211231 in words is "one billion, one hundred eleven million, two hundred eleven thousand, two hundred thirty-one".