1111231872 has 160 divisors (see below), whose sum is σ = 3481678200. Its totient is φ = 350853120.

The previous prime is 1111231871. The next prime is 1111231873. The reversal of 1111231872 is 2781321111.

It is an interprime number because it is at equal distance from previous prime (1111231871) and next prime (1111231873).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111231871) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 194172 + ... + 199812.

Almost surely, 2^1111231872 is an apocalyptic number.

1111231872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1111231872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1740839100).

1111231872 is an abundant number, since it is smaller than the sum of its proper divisors (2370446328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1111231872 is an equidigital number, since it uses as much as digits as its factorization.

1111231872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5686 (or 5665 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 1111231872 is about 33335.1446974511. The cubic root of 1111231872 is about 1035.7816905079.

Adding to 1111231872 its reverse (2781321111), we get a palindrome (3892552983).

The spelling of 1111231872 in words is "one billion, one hundred eleven million, two hundred thirty-one thousand, eight hundred seventy-two".