1121312320 has 28 divisors (see below), whose sum is σ = 2670125724. Its totient is φ = 448524800.

The previous prime is 1121312317. The next prime is 1121312327. The reversal of 1121312320 is 232131211.

It can be written as a sum of positive squares in 2 ways, for example, as 318836736 + 802475584 = 17856^2 + 28328^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1121312294 and 1121312303.

It is not an unprimeable number, because it can be changed into a prime (1121312327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1751731 + ... + 1752370.

It is an arithmetic number, because the mean of its divisors is an integer number (95361633).

Almost surely, 2^1121312320 is an apocalyptic number.

1121312320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121312320 is an abundant number, since it is smaller than the sum of its proper divisors (1548813404).

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

1121312320 is an equidigital number, since it uses as much as digits as its factorization.

1121312320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3504118 (or 3504108 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1121312320 is about 33486.0018515200. The cubic root of 1121312320 is about 1038.9042700222.

Adding to 1121312320 its reverse (232131211), we get a palindrome (1353443531).

The spelling of 1121312320 in words is "one billion, one hundred twenty-one million, three hundred twelve thousand, three hundred twenty".