1309121113 has 4 divisors (see below), whose sum is σ = 1313847460. Its totient is φ = 1304394768.

The previous prime is 1309121101. The next prime is 1309121129. The reversal of 1309121113 is 3111219031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 333683289 + 975437824 = 18267^2 + 31232^2 .

It is a cyclic number.

It is not a de Polignac number, because 1309121113 - 2⁵ = 1309121081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1309121213) 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, 2362758 + ... + 2363311.

It is an arithmetic number, because the mean of its divisors is an integer number (328461865).

Almost surely, 2^1309121113 is an apocalyptic number.

It is an amenable number.

1309121113 is a deficient number, since it is larger than the sum of its proper divisors (4726347).

1309121113 is an equidigital number, since it uses as much as digits as its factorization.

1309121113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4726346.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 1309121113 is about 36181.7787428976. The cubic root of 1309121113 is about 1093.9394283368.

The spelling of 1309121113 in words is "one billion, three hundred nine million, one hundred twenty-one thousand, one hundred thirteen".