1309121118 has 48 divisors (see below), whose sum is σ = 2905209216. Its totient is φ = 425917440.

The previous prime is 1309121101. The next prime is 1309121129. The reversal of 1309121118 is 8111219031.

It is a junction number, because it is equal to n+sod(n) for n = 1309121091 and 1309121100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122323 + ... + 132593.

It is an arithmetic number, because the mean of its divisors is an integer number (60525192).

Almost surely, 2^1309121118 is an apocalyptic number.

1309121118 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1309121118 is an abundant number, since it is smaller than the sum of its proper divisors (1596088098).

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

1309121118 is a wasteful number, since it uses less digits than its factorization.

1309121118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10449 (or 10446 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The square root of 1309121118 is about 36181.7788119932. The cubic root of 1309121118 is about 1093.9394297295.

The spelling of 1309121118 in words is "one billion, three hundred nine million, one hundred twenty-one thousand, one hundred eighteen".