1111231506 has 128 divisors (see below), whose sum is σ = 2853273600. Its totient is φ = 286003200.

The previous prime is 1111231439. The next prime is 1111231559. The reversal of 1111231506 is 6051321111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4323730 + ... + 4323986.

It is an arithmetic number, because the mean of its divisors is an integer number (22291200).

Almost surely, 2^1111231506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1111231506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1426636800).

1111231506 is an abundant number, since it is smaller than the sum of its proper divisors (1742042094).

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

1111231506 is a wasteful number, since it uses less digits than its factorization.

1111231506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 1111231506 is about 33335.1392077489. The cubic root of 1111231506 is about 1035.7815767914.

Adding to 1111231506 its reverse (6051321111), we get a palindrome (7162552617).

The spelling of 1111231506 in words is "one billion, one hundred eleven million, two hundred thirty-one thousand, five hundred six".