1123561272 has 32 divisors (see below), whose sum is σ = 2899514880. Its totient is φ = 362438880.

The previous prime is 1123561211. The next prime is 1123561279. The reversal of 1123561272 is 2721653211.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123561279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 754338 + ... + 755825.

It is an arithmetic number, because the mean of its divisors is an integer number (90609840).

Almost surely, 2^1123561272 is an apocalyptic number.

1123561272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1123561272 is an abundant number, since it is smaller than the sum of its proper divisors (1775953608).

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

1123561272 is a wasteful number, since it uses less digits than its factorization.

1123561272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510203 (or 1510199 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 1123561272 is about 33519.5655103105. The cubic root of 1123561272 is about 1039.5983631567.

The spelling of 1123561272 in words is "one billion, one hundred twenty-three million, five hundred sixty-one thousand, two hundred seventy-two".