1309029121 has 4 divisors (see below), whose sum is σ = 1386030852. Its totient is φ = 1232027392.

The previous prime is 1309029103. The next prime is 1309029133. The reversal of 1309029121 is 1219209031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1219209031 = 25583 ⋅47657.

It can be written as a sum of positive squares in 2 ways, for example, as 577921600 + 731107521 = 24040^2 + 27039^2 .

It is a cyclic number.

It is not a de Polignac number, because 1309029121 - 2¹¹ = 1309027073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1309029121.

It is not an unprimeable number, because it can be changed into a prime (1309029151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38500840 + ... + 38500873.

It is an arithmetic number, because the mean of its divisors is an integer number (346507713).

Almost surely, 2^1309029121 is an apocalyptic number.

It is an amenable number.

1309029121 is a deficient number, since it is larger than the sum of its proper divisors (77001731).

1309029121 is an equidigital number, since it uses as much as digits as its factorization.

1309029121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77001730.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 1309029121 is about 36180.5074729474. The cubic root of 1309029121 is about 1093.9138040122.

The spelling of 1309029121 in words is "one billion, three hundred nine million, twenty-nine thousand, one hundred twenty-one".