11111232231 has 48 divisors (see below), whose sum is σ = 18160740000. Its totient is φ = 6484504320.

The previous prime is 11111232227. The next prime is 11111232241. The reversal of 11111232231 is 13223211111.

It is not a de Polignac number, because 11111232231 - 2² = 11111232227 is a prime.

It is a super-2 number, since 2×11111232231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111232241) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1111845 + ... + 1121793.

It is an arithmetic number, because the mean of its divisors is an integer number (378348750).

Almost surely, 2^11111232231 is an apocalyptic number.

11111232231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11111232231 is a deficient number, since it is larger than the sum of its proper divisors (7049507769).

11111232231 is a wasteful number, since it uses less digits than its factorization.

11111232231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10384 (or 10381 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 11111232231 its reverse (13223211111), we get a palindrome (24334443342).

It can be divided in two parts, 11111 and 232231, that added together give a palindrome (243342).

The spelling of 11111232231 in words is "eleven billion, one hundred eleven million, two hundred thirty-two thousand, two hundred thirty-one".