1309121120 has 24 divisors (see below), whose sum is σ = 3092799024. Its totient is φ = 523648384.

The previous prime is 1309121101. The next prime is 1309121129. The reversal of 1309121120 is 211219031.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1309121092 and 1309121101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309121129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4090844 + ... + 4091163.

It is an arithmetic number, because the mean of its divisors is an integer number (128866626).

Almost surely, 2^1309121120 is an apocalyptic number.

1309121120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1309121120 is an abundant number, since it is smaller than the sum of its proper divisors (1783677904).

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

1309121120 is an equidigital number, since it uses as much as digits as its factorization.

1309121120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8182022 (or 8182014 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1309121120 is about 36181.7788396314. The cubic root of 1309121120 is about 1093.9394302866.

The spelling of 1309121120 in words is "one billion, three hundred nine million, one hundred twenty-one thousand, one hundred twenty".