12071518309 has 2 divisors, whose sum is σ = 12071518310. Its totient is φ = 12071518308.

The previous prime is 12071518297. The next prime is 12071518343. The reversal of 12071518309 is 90381517021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7262789284 + 4808729025 = 85222^2 + 69345^2 .

It is a cyclic number.

It is not a de Polignac number, because 12071518309 - 2⁹ = 12071517797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12071518609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6035759154 + 6035759155.

It is an arithmetic number, because the mean of its divisors is an integer number (6035759155).

Almost surely, 2^12071518309 is an apocalyptic number.

It is an amenable number.

12071518309 is a deficient number, since it is larger than the sum of its proper divisors (1).

12071518309 is an equidigital number, since it uses as much as digits as its factorization.

12071518309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 37.

The spelling of 12071518309 in words is "twelve billion, seventy-one million, five hundred eighteen thousand, three hundred nine".