1306005121 has 4 divisors (see below), whose sum is σ = 1333792512. Its totient is φ = 1278217732.

The previous prime is 1306005119. The next prime is 1306005131. The reversal of 1306005121 is 1215006031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1306005121 - 2¹ = 1306005119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1306005101) 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, 13893625 + ... + 13893718.

It is an arithmetic number, because the mean of its divisors is an integer number (333448128).

Almost surely, 2^1306005121 is an apocalyptic number.

It is an amenable number.

1306005121 is a deficient number, since it is larger than the sum of its proper divisors (27787391).

1306005121 is an equidigital number, since it uses as much as digits as its factorization.

1306005121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27787390.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1306005121 is about 36138.6928512917. The cubic root of 1306005121 is about 1093.0708011482.

The spelling of 1306005121 in words is "one billion, three hundred six million, five thousand, one hundred twenty-one".