1111551144 has 128 divisors (see below), whose sum is σ = 3102814080. Its totient is φ = 329011200.

The previous prime is 1111551131. The next prime is 1111551163. The reversal of 1111551144 is 4411551111.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a zygodrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2640054 + ... + 2640474.

It is an arithmetic number, because the mean of its divisors is an integer number (24240735).

Almost surely, 2^1111551144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1111551144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1551407040).

1111551144 is an abundant number, since it is smaller than the sum of its proper divisors (1991262936).

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

1111551144 is a wasteful number, since it uses less digits than its factorization.

1111551144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 647 counting only the distinct ones).

The product of its digits is 400, while the sum is 24.

The square root of 1111551144 is about 33339.9331732984. The cubic root of 1111551144 is about 1035.8808790554.

It can be divided in two parts, 1111 and 551144, that added together give a palindrome (552255).

The spelling of 1111551144 in words is "one billion, one hundred eleven million, five hundred fifty-one thousand, one hundred forty-four".