1121773572 has 72 divisors (see below), whose sum is σ = 2989598976. Its totient is φ = 353954304.

The previous prime is 1121773537. The next prime is 1121773573. The reversal of 1121773572 is 2753771211.

It is a happy number.

1121773572 is a `hidden beast` number, since 1 + 1 + 2 + 17 + 73 + 572 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1121773573) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73333 + ... + 87299.

It is an arithmetic number, because the mean of its divisors is an integer number (41522208).

Almost surely, 2^1121773572 is an apocalyptic number.

1121773572 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 1121773572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1494799488).

1121773572 is an abundant number, since it is smaller than the sum of its proper divisors (1867825404).

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

1121773572 is a wasteful number, since it uses less digits than its factorization.

1121773572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14097 (or 14092 counting only the distinct ones).

The product of its digits is 20580, while the sum is 36.

The square root of 1121773572 is about 33492.8883794754. Note that the first 3 decimals coincide. The cubic root of 1121773572 is about 1039.0467016395.

The spelling of 1121773572 in words is "one billion, one hundred twenty-one million, seven hundred seventy-three thousand, five hundred seventy-two".