1121723136 has 108 divisors (see below), whose sum is σ = 3252412800. Its totient is φ = 371804160.

The previous prime is 1121723101. The next prime is 1121723137. The reversal of 1121723136 is 6313271211.

It is not an unprimeable number, because it can be changed into a prime (1121723137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 438790 + ... + 441338.

Almost surely, 2^1121723136 is an apocalyptic number.

1121723136 is a gapful number since it is divisible by the number (16) 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 1121723136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1626206400).

1121723136 is an abundant number, since it is smaller than the sum of its proper divisors (2130689664).

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

1121723136 is a wasteful number, since it uses less digits than its factorization.

1121723136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2762 (or 2745 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 1121723136 is about 33492.1354350540. The cubic root of 1121723136 is about 1039.0311292322.

Adding to 1121723136 its reverse (6313271211), we get a palindrome (7434994347).

The spelling of 1121723136 in words is "one billion, one hundred twenty-one million, seven hundred twenty-three thousand, one hundred thirty-six".