1121644544 has 52 divisors (see below), whose sum is σ = 2298066960. Its totient is φ = 547061760.

The previous prime is 1121644523. The next prime is 1121644583. The reversal of 1121644544 is 4454461211.

It is a super-3 number, since 3×1121644544³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 1121644544.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 164597 + ... + 171275.

Almost surely, 2^1121644544 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 1121644544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1149033480).

1121644544 is an abundant number, since it is smaller than the sum of its proper divisors (1176422416).

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

1121644544 is an frugal number, since it uses more digits than its factorization.

1121644544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6744 (or 6722 counting only the distinct ones).

The product of its digits is 15360, while the sum is 32.

The square root of 1121644544 is about 33490.9621241313. The cubic root of 1121644544 is about 1039.0068625663.

The spelling of 1121644544 in words is "one billion, one hundred twenty-one million, six hundred forty-four thousand, five hundred forty-four".